As a music producer, after finishing produced mixes, the mix versions are moved to a Dropbox folder to listen to them. It would be great to be able to listen to them in a custom order without having to rename each file with numbers and then sort them by name.
For an album, it would be great to order the songs on the fly to see which order sounds best.
A great option would be a player in the style of VOX inside dropbox additionally with a level adjustment option for each audio file or mp3.