Musical activity during waking seems related to a higher amount of music dreams: About 6% of all remembered dreams contained music, & frequency was significantly higher when the participants spent time with music activities in waking (singing, playing an instrument)

König, N., Fischer, N., Friedemann, M., Pfeiffer, T., Göritz, A. S., & Schredl, M. (2018). Music in dreams and music in waking: An online study. Psychomusicology: Music, Mind, and Brain, 28(2), 65-70. http://dx.doi.org/10.1037/pmu0000208

Abstract: A connection between music and dreams has been reported in many cultures. Although inspirations by dreams were reported for famous musicians, there are few studies investigating the occurrence of music dreams in the general population. In the present online study, 1,966 participants filled out an online questionnaire concerning their involvement in music in waking and the occurrence of music in dreams. The basic framework for the study was the continuity hypothesis of dreaming; that is, more musical activity during waking should be related to a higher amount of music dreams. About 6% of all remembered dreams contained music, and the frequency was significantly higher when the participants spent time with music activities in waking like singing, playing an instrument, or listening actively to music—supporting the continuity hypothesis. In addition, music dreams were associated with more positive emotions. Future research should study the effects of music in waking on music in dreams over a longer period of time (dream diaries), as well as the dreams of professional musicians.