Hey man, welcome to Steemit!!! Since you're a composer, I would tell you the best two music scenes here, IMO, are #thecut and SMA.

Here are invite links to the two communities. SMA /// The Cut

SMA is more music based. You will find everything there. From MC's, to singers, to musicians, to other producers and composers.

Thecut is pure hiphop. If you are looking for mcs to grace an instrumental you did, that's the place to go.

Welcome and hope you enjoy Steemit!