Advice wanted: OTA jailbreak for iPad 2, 7.04

I just bought an iPad Air and I am now thinking of jailbreaking my iPad 2. I have no PC or Mac available, so this jailbreak would need to be untethered. What is the best/safest method?

a secondary question: once I've jail broken the iPad 2, can someone recommend an app for extracting the non DRMed music from the music app?