The Entertainment Retailers Association created the logo and says it will emphasize that MP3s can be played in all media players.
7digital's Ben Drury added that digital sales "have been booming because users love the freedom of MP3".
"The beauty of an MP3 file is that once you have bought it, you don't need to be a computer genius or a lawyer to make it work and you are not locked in to a relationship with a single retailer or hardware manufacturer," he said.
The BPI is also standing behind the new proposal.
"This logo will not only help give consumers confidence that the music files they are buying will play on a wide range of devices, but will also help them know that they are legal and that artists are getting paid," noted Geoff Taylor, BPI chief executive.