My son was a music major at Yale, and his buddy with similar interests and backgrounds went to Princeton. I think both were very happy with the opportunities. I will say that Yale’s musical theater scene is pretty awesome, as is the a cappella scene. There are also multiple comedy improv groups.
While my son was at Yale he performed with the Yale Precision Marching Band, the Yale Concert Band, the Yale Jazz Ensemble (briefly), a funk band, a new-music ensemble, and pit orchestras for multiple shows. And a few other similar things. He had his music performed by several of those groups, as well as one of the student-run orchestras. He wrote incidental music for a couple of shows, and later wrote the music for a musical that was produced at Yale (entirely by students).
My daughter (who is not a music major) sings with the Glee Club, sang a couple of times with the Yale Jazz Ensemble, performed in a spoken-word poetry group, and wrote the book and lyrics for the same musical mentioned above. In addition to non-music related activities. (And she worries that she isn’t doing enough extracurriculars.)
And they aren’t really unusual. Lots going on at Yale. I think Princeton is pretty similar.