Studies worth looking at on google scholar
Assal Habibi, et al (2014). An equal start: absence of group differences in cognitive, social, and neural measures prior to music or sports training in children. Frontiers in human neuroscience, 8.
Tierney, A. T., Krizman, J., & Kraus, N. (2015). Music training alters the course of adolescent auditory development. Proceedings of the National Academy of Sciences, 112(32), 10062-10067.
Swaminathan, S., & Schellenberg, E. G. (2016). Music training. In Cognitive Training (pp. 137-144). Springer International Publishing.
Degé, F., Kubicek, C., & Schwarzer, G. (2011). Music lessons and intelligence: A relation mediated by executive functions. Music Perception: An Interdisciplinary Journal, 29(2), 195-201.
Slater, J., Skoe, E., Strait, D. L., O’Connell, S., Thompson, E., & Kraus, N. (2015). Music training improves speech-in-noise perception: Longitudinal evidence from a community-based music program. Behavioural brain research, 291, 244-252.