I listen to classical music just about every day. Lots of other stuff, too, but mostly classical. Seems like I've been gravitating more and more to Baroque era music, specifically, as the years go by. Fortunately, there's lots of it out there. Here's a short list of tunes that I'm likely to hear every now and again:

Handel: Concerto Grosso, Op. 6, No. 6

Bach: Mass in B minor

Haydn: String Quartet, Op. 76, No. 4

Mozart: String Quartet No. 15, KV421

Beethoven: String Quartet No. 15, Op. 132

Schubert: String Quintet, D.956

Bruckner: Symphony No. 5

Sibelius: Symphony No. 4

Prokofiev: Piano Concerto No. 3 (plus more)