Renowned for his wide range of characters and singing abilities , he performed Muppet characters on `` Sesame Street '' , `` The Muppet Show '' , `` Fraggle Rock '' , and various Muppet movies and specials .
He was known for his wide range of characters and singing abilities . He performed Muppet characters on `` Sesame Street '' , `` The Muppet Show '' , `` Fraggle Rock '' , and various Muppet movies and specials .