UIUC has both an excellent engineering program and a great music program. U Indiana has Jacobs School of Music and great academics, Oberlin has excellent academics and an excellent music conservatory. For more of a reach overall (Jacob’s School of Music itself is very competitive) you could try NYU or USC.
Other colleges to look at are U Michigan, U Rochester, and U Miami.
I’m not sure how their piano programs in particular measure up, but all have both great academics and great music programs,