Who sings in the band Tokio Hotel, Bill Kaulitz, Cristina Scabbia or both?
Bill Kaulitz: Bill Kaulitz (born September 1, 1989), also known mononymously as Billy (stylized as BILLY) for his solo act, is a German singer, songwriter, voice actor, designer, and model. Bill Kaulitz:  He is best known for his work from 2001 to the present as the lead singer of the band Tokio Hotel. Cristina Scabbia: Cristina Adriana Chiara Scabbia (] ; born 6 June 1972) is an Italian singer and lyricist, best known as one of the two vocalists in the Italian Gothic metal band Lacuna Coil.
Bill Kaulitz