How do I transfer music from my phone to my computer?

you'll need a USB addapted SD card reader... just plug your card to the card reader then plug it in you USB port then your computer should recognize it as a removable devide where in you can transfer files

I'd like to add one thing to what duane said. The USB cable should have come with your phone! If not, contact the folks that sold you the phone. And, here's the addition---if you have a Windows Mobile operating system on your phone, you'll need to have the program to 'sync' your phone and your PC together, through the USB cable. Without knowing exactly what kind of phone you have, it may be a good idea to double check your user manual for anything more specific....