Simplify the following text for a Grade 6 native English-speaking person.
Original: Bo Diddley often sang simple or amusing songs about himself . Some of these songs are `` Bo Diddley '' ( 1955 ) , `` Diddley Daddy '' ( 1955 ) , `` Hey Bo Diddley '' ( 1957 ) , `` Bo Meets The Monster '' ( 1958 ) , `` Bo Diddley 's A Gunslinger '' ( 1960 ) , `` Just Like Bo Diddley '' ( 1989 ) , `` Bo Diddley Is Crazy '' ( 1996 ) and `` Oops !
Simplified: Bo Diddley 's songs have frequently been covered by other artists .