Unlike most rock bands, Eels rarely plays with the same combinations of members twice. Mark Everett is the only constant member. He is the only one who plays on every single album and live show. All other members are friends of his who add other instruments to the albums and concerts. Most of them are in other bands, such as Aysa and Chloe from the pop band Smoosh. Many do not use their real names, as Everett does. For example, bassist Koool G Murder performed on the albums "Souljacker" and "Hombre Lobo", and has played bass at most shows on the tours for both albums.