Simplify the following text for a Grade 5 native English-speaking person.
Original: The original music was composed by Koji Kondo and Hirokazu Tanaka , both of whom did music for several other Nintendo games at the time .
Simplified: The music was composed , or written , by Koji Kondo and Hirokazu `` Hip '' Tanaka . Both men made music for other Nintendo games at the time , such as Metroid .