How do I load song to micro SD card from a blackberry bold?

I have a bid SD card that the micro one goes into, But I dont have it with me. Now I have a USB cable that connects to the PC to my phone. I have the micro SD card in my phone. I want to load songs from my computer to the blackberry (Like a drag and paste kinda thing) Thanks!!

Also it doesnt load in computer, would I need the blackberry desktop software