There's this song I'm thinking of but I can't remember what it's called its a fast classical song in minor key and since it's classical there are no lyrics and it is mostly string instruments and it's kinda like d-d-d-d-dah d-d-d-d-dah d-d-d-d-d-d-d-d-d-dah da-da-da-da-da-da-da-da-da-da-da-da-da-da-dah and then it repeats and the next part is kinda like da-da-da-da-d-d-d-d-dah [repeats softly] da-da-da-da-d-d-d-d-dah [repeats softly] and then it repeats the first part. I think it's written by Beethoven but I'm not sure. Please help.
Beethoven and fast, my first guess would be moonlight sonata 3rd movement.
But if you're not much of a classical connoisseur, there's a very good chance you'll find it at the top 100 list: http :// kickassclassical . com/classical-music-popular-famous-best-top-100-list.html
(In my humble opinion, it's good to have it within reach regardless.)