Oliver Hartmann is a German metal vocalist, guitarist, songwriter, and producer who performed in various acts, either as guitarist, solo or choir singer. He is best known for his role as vocalist and one of the founders of the band At Vance, his own band Hartmann and his guest appearances on albums of several prominent metal bands, including Freedom Call, Edguy, Rhapsody, Genius rock opera, Iron Mask, Aina's metal opera Days of Rising Doom and the metal opera Avantasia where he participated as a vocalist in 4 albums and also as a guitarist of the live and studio line up. He is also guitarist and vocalist with the Pink-Floyd tribute band Echoes.

Rüsselsheim am Main is the largest city in the Groß-Gerau district in the Rhein-Main region of Germany. It is one of seven special status cities in Hessen and is located on the Main, between Frankfurt and Mainz, only a few kilometres from its mouth in Mainz. The suburbs of Bauschheim and Königstädten are included in Rüsselsheim. Rüsselsheim has attained international recognition through the presence of the German car company Opel.