Review: Samsung Blast
Despite the inclusion of stereo Bluetooth, the Blast is definitely a messaging phone, not a music phone. It includes a very basic music player, which cannot play in the background. You have to add files to the music player's playlist by searching any folder on your phone or card for them.
Tracks are only displayed by file name, no ID3 data is read for them. Once music is playing, you can manually choose to send it to your Bluetooth headphones if your Blast is connected to them. However when you quit the music player, your headphones will be disconnected as well.
If you only use your phone's music player for listening to a few favorite tracks on a commute or similar situations, the Blast will suit your needs. But if you want more, it is not as an iPod replacement.