The tunes tracks and mixes listed here are copyright and may not be used in your projects. Saying that though many members are happy to work with other artists or allow others to remix their tracks.
Most people upload tracks to looperman in order to get feedback from other artists. The best way to get feedback on your own tracks is to get involved and leave comments on other peoples tracks.
If you wish to do anything more then simply listen to and enjoy the tracks listed here get in touch with the artist who created them.
Read the tracks section of the help area for more information on member tracks.