Progressive rock came to be appreciated overseas, but it mostly remained a European, and especially British, phenomenon. Few American bands engaged in it, and the purest representatives of the genre, such as Starcastle and Happy the Man, remained limited to their own geographic regions. This is at least in part due to music industry differences between the US and Great Britain. Cultural factors were also involved, as US musicians tended to come from a blues background, while Europeans tended to have a foundation in classical music. North American progressive rock bands and artists often represented hybrid styles such as the complex arrangements of Rush, the hard rock of Captain Beyond, the Southern rock-tinged prog of Kansas, the jazz fusion of Frank Zappa and Return to Forever, and the eclectic fusion of the all-instrumental Dixie Dregs. British progressive rock acts had their greatest US success in the same geographic areas in which British heavy metal bands experienced their greatest popularity. The overlap in audiences led to the success of arena rock bands, such as Boston, Kansas, and Styx, who combined elements of the two styles.