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– Vivaldi’s concertos
– Haendel’s Water Music, Music for the Royal Fireworks, Concerti Grossi, Organ Concerti, coronation anthems and operas
– Bach’s Brandenburg concertos, Orchestral Suites, Violin/Harpsichord concertos
– Corelli’s concerti grossi
– Albinoni’s concerti
Try and find performances by the English Concert, conducted by Trevor Pinnock.
Each one likes their own kind of music: in Classical Music genre you can hear from one or some instruments played to a hundred players and their conductor.
From biggest to smaller (an example):
Symphonies
Symphonic Poems
Concertos
Suites
Quartets
Solos
If you like really impacting music then try Symphonies, then Concertos, …
If you like intimate music could try trios, quartets, …
Next step will be to hear each period on music evolution:
Baroque
Classical
Romantic
Modern
Contemporary
Of course, classical music is the name of that genre so you can start with classical period.
You know already many composer names because of culture in human world. But you can discover many other composers to champion their works.
So, your collection will start with some of your likes and then came a no end search of new discovering.
Search your downloads in forums, blogs and many places like those where people shares their excellent music and souls.