Music which one are able to recreate from some form of score is the defining aspect of r/composer.
r/Composer is a music depository, meaning every post is a link to a work of music. You can submit links to sheet music, audio, or - ideally - both.
* Music for traditional instruments (western classical music) are not obliged to provide a score. However, this is courteous, and helps us making suggestions for improvement.
* Music for and including non-traditional and electro-acoustic instruments must provide a score.
scribd and google docs are great for posting manuscripts and scores; soundcloud for your recordings. Remember to enable download in soundcloud if you would like people to bring your music around.
Resources
Sample libraries:
Vienna Symphonic Library http://vsl.co.at/ All standard instruments, choir
East West http://www.soundsonline.com/ All standard instruments, choir, "ethnic", instruments aimed at soundtracks and pop
The Music Box http://www.badcatmediagroup.com/ Music box
Software
Sibelius http://www.sibelius.com/products/sibelius/7/index.html Notation, MIDI playback
Cubase http://www.steinberg.net/en/products/cubase/start.html Sequencer
Copyright
All music and scores are held outside reddit, and presumably on your personal account on websites. You can at any time pull your music and the link in your post will be dead.
r/composer or the moderators does not deal with copyright questions related to reddit.
If there's a dispute as to the owner of a piece it will be pulled and the moderators will take no action until a proof is made.