The effect of music when used during studying varies from one person to another, But for those of you who are doing better with music, I have here some of the most recommended/best music that can be played while studying:

Music for Airports by Brian Eno
The Wall by Pink Floyd;
Disintegration Loops by William Basinski
Mushroom Jazz by Mark Farina
Haydn’s piano pieces
Mozart Piano Concertos
Mozart Piano Sonatas
Glenn Gould
Schubert Symphonies

There is other lot of music that serves great for people who makes use of them to perform better. Majority of these people prefer ambient music or instrumental music but it actually depend on the personality and music preference of  the individual because I heard of some who wants to listen to rock music while they are writing or doing something.