Great royalty-free music composers
There's a huge number of royalty-free music composers around - here are some of the really good ones:

Organique
A Finnish composing team that lives up to its name, with a great organic, living and breathing sound!

Guitarsstate
Ventsislav Lalev - AKA Guitarsstate - has a brilliant, groovy sound that goes well with a wide range of projects.

alkis
A talented and versatile composer, and I especially like his glitchy audio logo work.

Benji Jackson
Benji has a knack for creating great-sounding corporate/motivational tracks.

Russell Bell
Does some really great orchestral work which lends itself great to cinematic and trailer projects.