Just a hobby composer/arranger/mixer here trying to have some fun with like-minded musicians around the world ...
I try to use every contribution to my song ideas that I get. If that means multiple versions of the same song, that's great! So if you are, say, a singer or a lyricist, and a project already has vocals or lyrics, don't hesitate to add your ideas anyway! Most likely they will be used. :)
As for contributing to other people's projects: Don't hesitate to ask me if you need a mixing guy! That's what I love to do and what I'm best at. I removed "Keyboards" from my list of talents because 'm not good (not even mediocre) at it, and I'm definitely NOT a piano player.
I use Cubase for production (composition, arrangement) and mixing, REAPER for (single-file) mastering and Studio One or Sonar for Melodyne jobs. Every now and then I do a mix in Sonar, Pro Tools, Studio One or REAPER too, but I definitely prefer the Cubase workflow and feature set.
I love the music of the 70s (disco, singer/songwriter, classic rock, progressive rock, ...). Not a big fan of modern stuff, but there are exceptions.