@jerzmaster music at OU is a demanding major, how demanding may depend on your instrument. My D started with a music minor but found the amount of time required for practice, rehearsals, ensembles and performances was just too much in addition to her other classes. She has since dropped the music minor and changed to a double major in comp sci and meteorology with minors in math and German and found this much less time consuming.
DD is still taking private lessons on her instrument, it’s counted as a class so it’s cover under her scholarship and the class has a performance component but is much less time consuming. One thing to keep in mind is that the School of Music is diagonally across campus from the dorms so it takes a good amount of time to get there and back everyday to practice. She also found there were often conflicts with the many rehearsals and performances and other activities she’d rather be doing.
Another thing that surprised me was that AP Music Theory does not count for a class that meets the Gen Ed requirements for the Fine Arts requirement at OU.