looking for a masters program which would allow me to do 2 degrees at once

[luxuchu]

Hello, I am a recent undergrad graduate and have three degrees in math, history and piano performance. I would like to go to a grad school with the freedom of letting me design my own major or double majoring since I am both interested in piano performance and music history (musicology). More specifically, I am interested in researching and performing 19th century piano duet arrangements of symphonies and chamber music, and explore how did the arrangers keep the originality as best as they can and how did these arrangements functions as a tool for the general public to know these complex non-pianistic music, and finally, try to bring this “tradition” back into the modern world. Please let me know if you have any suggestions. Thank you.
Tony