By Invitation Only is a tribute album by the Michael Schenker Group released in 2011. This album, made up of songs that influenced the career of Michael Schenker, includes guest performances from members of various bands, including Whitesnake, Blue Öyster Cult, Yngwie Malmsteen, and Iron Maiden. It's a re-release of the Heavy Hitters album from 2005, with one extra song ("Run To The Hills").