We're loving Berlin-based, Bulgarian singer, Dena. She's picking up loads of M.I.A. comparisons and getting shout-outs from the likes of NME and Vogue. Her debut album, Flash, drops this week (you can get it here), so Dena popped into our Berlin office for a chat. We grilled her on why Flash is well worth a listen and how she'd react if Jay Z gave her a call…