Music Therapy-Based Aerobic Exercise Training group will follow the same treadmill exercise program as the Traditional Aerobic Exercise group. However, during the exercise sessions, music therapy will be applied according to the beats per minute (BPM) ranges specified below: Warm-up (10 minutes, BPM: 80-100): Low-intensity walking accompanied by slow-tempo music Loading Phase (20-30 minutes, BPM: 120-140): Moderate-to-high intensity walking accompanied by rhythmic, motivational music Cool-down (10 minutes, BPM: 80-100): Low-intensity walking accompanied by slow-tempo sedative music Music will be used throughout the exercise sessions to regulate participants' heart rate and blood pressure, reduce perceived fatigue, enhance motivation, and support rhythmic movement patterns. During training, participants' heart rate and oxygen saturation will be monitored using a fingertip pulse oximeter.

The FEV1/FVC ratio is a key marker in distinguishing obstructive from restrictive pulmonary patterns. This ratio will be calculated and expressed as a unitless value. Testing will follow ATS/ERS spirometry criteria and be performed using a COSMED MicroQuark spirometer (COSMED, Italy).

PEF is the maximum speed of expiration and indicates large airway function. It will be recorded as a percentage of the predicted value and used to monitor bronchial flow capacity and effort. Evaluation will be conducted according to ATS/ERS standards using the COSMED MicroQuark spirometry device (COSMED, Italy).

FEF25-75% measures the average flow rate during the middle half of the forced expiration. It reflects small airway function and early signs of airflow limitation, reported as a percentage of predicted normal values. All measurements will be obtained in line with ATS/ERS guidelines using the COSMED MicroQuark spirometer (COSMED, Italy).

MIP will be measured to evaluate inspiratory muscle strength using a portable electronic intraoral pressure measuring device (MicroRPM, Micro Medical; England), in accordance with ATS and ERS criteria. Participants will perform a maximal inspiratory effort (Müller maneuver) for a few seconds through the mouthpiece, and the highest value will be recorded in cmH₂O.

MEP will be assessed to determine expiratory muscle strength using the same MicroRPM device (Micro Medical; England), following ATS and ERS standards. Participants will perform a maximal expiratory effort (Valsalva maneuver) for a few seconds, and the peak pressure value will be recorded in cmH₂O.

The 6-Minute Walk Test (6 DYT) will be used to assess the submaximal functional capacity of the participants. The aim of the 6-Minute Walk Test is to walk the longest distance possible in a 30-meter corridor in 6 minutes. The 6 DYT will be performed in accordance with the guidelines reported by the American Thoracic Society.

BMI will be automatically calculated by the OMRON BF511 Body Composition Monitor (OMRON Healthcare Co., Japan) using the entered height and measured weight. It will serve as an indicator of general body composition and nutritional status.

Body fat percentage will be assessed using the OMRON BF511 Body Composition Monitor (OMRON Healthcare Co., Japan). This parameter will provide insight into total fat mass relative to body weight, contributing to the overall evaluation of body composition.

Skeletal muscle ratio will be determined with the OMRON BF511 Body Composition Monitor (OMRON Healthcare Co., Japan). It will represent the percentage of skeletal muscle mass in relation to total body mass and be used to assess muscular health and function.

Basal Metabolic Rate will be measured in kilocalories per day using the OMRON BF511 Body Composition Monitor (OMRON Healthcare Co., Japan). This value reflects the daily energy expenditure at rest and will be used to assess metabolic function.

Postural stability will be assessed using the "Postural Stability Test" module of the Biodex Balance System (Biodex Medical Systems, Shirley, NY, USA). This test evaluates the ability to maintain a stable position on a static or dynamic platform. Higher scores indicate poorer balance performance, and results will be used to assess static and dynamic postural control.

The "Limits of Stability Test" on the Biodex Balance System (Biodex Medical Systems, Shirley, NY, USA) will measure the participant's ability to voluntarily shift their center of gravity toward various directions without losing balance. A lower score represents better dynamic balance and postural control.

The "Clinical Test of Sensory Integration of Balance" will be performed using the Biodex Balance System (Biodex Medical Systems, Shirley, NY, USA) to evaluate how the somatosensory, visual, and vestibular systems contribute to postural stability. This score helps determine the sensory system impairments affecting balance, with higher scores reflecting greater postural sway and reduced sensory integration.

Handgrip strength will be assessed for upper extremity muscle strength assessment. This assessment will be performed on the dominant hand with a hydraulic hand dynamometer (JAMAR hydraulic hand dynamometer, ABD) and each measurement will be repeated 3 times to determine the maximum grip strength and the average will be recorded.

Lower extremity muscle strength and fall risk assessment will be performed with the "Timed Up and Go Test (TUG)". Participants will be asked to get up from a chair with a seat height of approximately 46 cm, walk 3 meters and sit down again, the completed time will be recorded in seconds.

The "30 Second Sit-to-Stand Test" will be used for lower extremity muscle strength assessment. Participants will be asked to get up and sit down from a chair with their hands crossed on their chest for 30 seconds with as many repetitions as possible.

Physical activity level will be assessed with the "Physical Activity Scale for the Elderly (PASE)". "PASE" assesses the physical activity of elderly individuals in the last week. Participation in leisure time activities, housework and work-related activities is recorded in the scale. There are options for the duration of the activity as less than 1 hour, between 1 and 2 hours, 2-4 hours or more than 4 hours. Paid or unpaid work-related activities are recorded as total hours per week. Housework activities (light and heavy); gardening, home repairs, outdoor activities and activities related to caring for others are expressed with the options 'Yes' and 'No'. The calculation of the total score of the scale is carried out by multiplying the time spent on each activity (hours/week) or participation in an activity (yes/no) by the item values and summing the scores of all activities.

Depression assessment will be performed with the "Geriatric Depression Scale-15 (GDS-15)". The "Geriatric Depression Scale-15" is a depression scale developed for the elderly population. It is prepared in a way that elderly individuals can answer "yes" or "no", consisting of a total of 15 questions. In the evaluation of the scale, 1 point is given for each yes answer in favor of depression, and 0 points are given for a no answer. The total score obtained from the scale is accepted as the depression score. The scale is scored as follows; 0-10 points as "no depression", 11-13 points as "possible depression", and 14 and above as "definite depression". When the threshold value for the "Geriatric Depression Scale-15" scores is taken as 14, its specificity approaches 100%.

Quality of life will be assessed with the "Quality of Life Scale in the Elderly - Short Form". This scale was developed by Bowling and his colleagues to be used in the assessment of quality of life in the geriatric population. In the single item asked at the beginning of the test, the person is asked to score their quality of life as 1-very bad and 5-very good, but this score is not evaluated together with the total scale score. For each item, answers are given as 1-strongly disagree and 5-strongly agree and consist of a total of 13 items. The total score is calculated between 13-65. Higher scores indicate better quality of life.

The Montreal Cognitive Assessment Scale (MoCA) will be used to evaluate cognitive functions. MoCA is a questionnaire developed to evaluate different cognitive functions and mild cognitive impairment. The cognitive functions evaluated in the test are; memory, concentration, memory, language, abstract thinking, orientation, calculation, visual structuring and executive functions. The maximum score that the patient can obtain from the test is 30, a score of 21 or above will be considered as no mild cognitive impairment.

Participants' enjoyment of exercise will be assessed with the "Exercise Enjoyment Scale". Each item is assessed on a scale of 1 to 7 points, with a neutral point of four indicating how much the participant enjoys the exercise, based on the participant's response to the question "How do you feel about the exercise you are currently doing?" The higher the score the participant will receive from the scale, the more they enjoy the physical activity.