However, Anne Rice has consistently and aggressively prevented fan fiction based on any of her fictional characters (mostly those from her famous Interview with the Vampire and its sequels in The Vampire Chronicles ). She, along with Anne McCaffrey (whose stance has been changed by her son, Todd McCaffrey, since her death) and Raymond Feist , have asked to have any fiction related to their series removed from .  George . Martin , who was selected by Time magazine as one of the "2011 Time 100" and is most famous for his epic fantasy series, A Song of Ice and Fire , is also strongly opposed to fan fiction, believing it to be copyright infringement and a bad exercise for aspiring writers.   Sharon Lee and Steve Miller , creators of the Liaden universe , strongly oppose fan fiction written in their universe, Lee saying that "Nobody else is going to get it right. This may sound rude and elitist, but honestly, it's not easy for us to get it right sometimes, and we've been living with these characters... for a very long time." 
A wide range of instruments can be found in a filk circle, although the most common is the acoustic guitar .  Acoustic instruments are more common than electric instruments, although portable keyboards and even theremins are not unheard of.  Small, easily portable instruments are more common than large ones, although larger items such as small drum kits and upright basses can be found at some filk circles. A large filk circle might play host to an array of folk and Celtic instruments such as fiddles , mandolins , dulcimers , banjos , flutes , recorders , bodhráns , bongos and darbukas .