There's at least five artists under the name "Otto":
1.The composer, singer and percussionist Otto was born in Pernambuco, Brazil, and he was, along with Chico Science, Fred 04 and others, one of the creators of the Manguebeat movement, a revolution in Brazilian music.
2. aka DJ Toto from Colombia, who has avery nice release on the net-label Corporate Identity http://www.corpid-label.de
3.A Turkish hardcore band from the Istanbul underground music scene
4. German comedian-act, director (and musician too) Otto Waalkes.
5. Band from Oxfordshire
6. A German Electro-Kraut pairing of Alexander Arpeggio and Cid Hohner. Correctly called OTTO, an acronym for Over The Top Orchestr.