Music has long been used as therapy for the intellectual disabled (ID). However, the number of studies investigating the effect of music on the performance of ID people is limited. Therefore, the aim of this study is to investigate the effect of functional warm-up (FWU) in different musical rhythms on anaerobic performance of mentally retarded individuals from morning to evening. 14 (7 male, 7 female) (age: 12.64±1.15 years, height: 153.50±11.95 cm, weight: 55.19±17.91 kg, body mass index (BMI): 22.86±5.06) moderately and mildly ID individuals aged 11-14 years participated in this study. In the study, participants received no music (NM), a low music phase (LMP) phase (80-90 bpm), a modarate musical rhythm phase (MMP) (130-140 bpm), and a high music phase (HMP) (170-180 bpm) with FWU applied. To determine anaerobic performance after FWU application, the Sargent protocol vertical jump test was performed while music was playing. The same procedure was repeated in the morning (between 08:00-10:00) and in the evening (between 16:00-18:00). In the study, participants' anaerobic power level increased significantly from morning to evening as the music rhythm increased (p= .000, F=8.643). According to the post-hoch test, there was a significant difference between the NM phase in the morning (M) and the MMP-M (p= .003), the HMP-M (p= .003), the MMP in the evening (E) (p=.003), and the HMP-E (p= .001). There was no significant difference between the LMP, MMP and HMP values in the morning and the music given in the evening (p >.05). According to the results of our study, the anaerobic power values of the ID individuals were higher in the evening. However, it was found that they could reach their performance level in the evening if they listened to llow, modarate and high rhythm music in the morning. Therefore, in order to obtain the maximum benefit from sports activities for people with ID, it is recommended that these activities be performed either in the afternoon or in the morning accompanied by high rhythm music.