Quadro Nuevo is a small group from a small town in Bavaria/Germany; they play a mixture of Jazz, Tango, Flamenco and a few more styles, all mixed up. They have a very original repertoire, and are real masters of their instruments. This is especially impressive at live performances. Be sure to get your tickets a month early, at least, or you won't get good seats.
If you want to give them a try, listen to Mocca Flor (especially 5. Mocca Swing and 11. Tango Gosselin), which is music like you'd expect it in an Arabian coffee house. Or Canzone Della Strada, which has a more Italian influence. The CDs sound much better than the music on the web site, of course.
You can buy them through Amazon or directly at their site. I'm not affiliated with them, and I get no money by promoting them, but I want to make sure they get lots of money so they can eat enough to play many more years. :-)
Montag... very thoughtful and wonderfully depressing songs in their debut album (less so in the second one though, unfortunately). A relatively unknown band from Hamburg; singing in German, but sounding quite different than other German bands.