Alice in Wonder City (2012)

Both have more or less the musical premise although Beethoven Virus is more superior

I would say both heroines have something in common, although in Alice in Woncer City she has her violin and Nae Il has a piano, if you likes tomorrow's cantabile and you wanted more kiss scenes you should watch Alice in Wonder City

They both have Aaron Yan in it. They both have similar tones, but Aaron Yan's character in GAAM/AIWC is darker than his character in MIT

They both have music as its theme. Both have a darker side to music (when it comes to the male lead). Both have characters that play a violin and a piano. They both have a similar tone/mood in the show.