probably his 40'th symphony,1'st movement
Undoubtedly, Mozart's most famous piece is Eine Kleine Nachtmusik for string ensemble. His popular symphonies include Symphony 40 in G minor and Jupiter symphony. His popular piano works include Twinkle-twinkle variations and Turkish Rondo.
There are a number of key pieces. Beethoven's 5th symphony is extremely popular. His Fur Elise is a very popular short piece of music.
aida
Depending on where you are from, the most popular songs by Mozart in America are; the first movement of Eine Kleine Nachtmusik, Symphony No. 40, Piano Concerto No. 21, and Piano Sonata in A Major K. 331.
Moon River
The type of music that is most popular is the music that is most popular!
Popular music! because it's popular... music... hahaha
fungi music is the most popular music in the british virgin island
Pop music is the most popular mode of music in contemporary culture.
It is my personal experience that in the original monopoly, the money bag is the most popular piece. There are different opinions but most people wan to to the money bag. In the new electronic banking, the Altoids is the most popular piece.
Handel's fireworks music
Most likely (though most don't know it) is Twinkle Twinkle Little Star. Written by Wolfgang when he was 5. I also think Jupiter, his 41st, is rather famous also.