The SANDBOX forum is just another song forum. It's at the bottom of the song forums list.
Here: http://www.irealb.com/forums/forum.php

Since admin will purge it from time to time, it's the best place to post playlists made up of songs that have been already posted elsewhere in the main song forums.
New songs as well as different versions are welcome.
There's no need to archive the same songs over and over.
)BOB