Critics of the genre often limit its scope to a stereotype of long solos, overlong albums, fantasy lyrics, grandiose stage sets and costumes, and an obsessive dedication to technical skill. While progressive rock is often cited for its merging of high culture and low culture, few artists incorporated literal classical themes in their work to any great degree, and only a handful of groups purposely emulated or referenced classical music. Writer Emily Robinson says that the narrowed definition of "progressive rock" was a measure against the term's loose application in the late 1960s, when it was "applied to everyone from Bob Dylan to the Rolling Stones". Debate over the genre's criterion continued to the 2010s, particularly on Internet forums dedicated to prog.