If you like small groups of instrumentalists in the Blues context, then maybe dip your toe in some chamber music, which is for smaller groups, either groups of strings or strings plus keyboard, or wind plus keyboard or wind ensembles, or basically any combination you can think up. Try a few acknowledged masterpiece works, and see if they are to your liking. You can sample some pretty good recordings for nothing via youtube which will save endless time and heartache.
So perhaps try Schubert's Quintet in C, written in 1828 the extrarordinary last year of his tragically short life when he composed some of his finest music, or Beethoven's Archduke Trio for Piano, Violin and Cello or for something more contemporary the Samuel Barber Quartet in B minor - the slow movement he arranged as the Adagio (think Platoon).
Or perhaps a single performer is of more interest - endless solo piano to consider along with solo cello. Try Bach's Suites for Solo Cello - or for piano, maybe try some Chopin - the Preludes - which gives you a wide range of the different musical moods, colours and emotions that Chopin can draw from the piano, from miniatures lasting barely a minute to more extended pieces.
If you love Swan Lake - try some more Tchaikovsky - the Pathetique Symphony, or the First Piano Concerto. Or try Rimsky-Korsakhov - Scherezade is rightly famous, and there is huge amounts of his music that is not well known today
If you like big orchestral, start exploring from Mozart's Jupiter Symphony, Haydn's London Symponies, Beethoven, say his 7th and 9th symphony, Schubert's Unfinished, Schumann, through to developments such as Berlioz Symphonie Fantastique, Tchaikovsky's symphonies, Brahms, and onwards into the 20th century via Bruckner and Mahler. Until eventually if you follow Viennese composers through you arrive at people like Korngold who, lo and behold, wrote for many Hollywood movies.
But oh my goodness if you love Handel, there is a treasure trove there. Because after Fireworks, Water Music, Messiah - there are some of the greatest operas ever written (out of 40 or so, Giulio Cesare (tells the story of Julius Cesar and Cleopatra) and Rodelinda contain some of the greatest arias). Or Saul - his oratorio, based the bible story around Saul, David and Jonathan - is amazing.
But if you like the sound of Baroque but not voices, there are Handel's Concerti Grossi. And in this vein, Bach - where to begin is hard - some of the Brandenburg Concertos maybe, double violin concertos. Bach is another thing altogether.
The Radio 3 website is stuffed full of information about composers, and if you drill down a bit there are huge numbers of programs and talks about composers and their works that are available for free. It really is quite dreadfully arranged, and you need to persist. This is stuff that isn't on iplayer. You'll find whole half hour programs just talking about one piece of music. They devoted a few weeks to playing every work every written by Schubert a couple of years ago, and quite a lot of the programs about his life and works are available for listen to. And check all their podcasts too - Howard Goodall's history of music in 50 signnificant pieces is still around to listen to - it's clever, and each program is only a few minutes long. No one will agree on all of them, but he isn't afraid to debunk a few myths.
