I have a Samsung Brightside and I have a memory card in it. For some reason I can't get the music on my card to show up on my phone. whenever i go to My music it says there is no music.
Go to Settings...Memory...Sounds...Current Sounds and Change to Card Memory.
You may also get the error "no memory available remove files". To fix this move everything from the phone memory to the card memory by:
Settings...Memory...Phone Memory...(scroll down to) Move all to card.
That worked for me without deleting anything.