text: This clef is used for the upper ranges of the bassoon , cello , euphonium , double bass , and trombone ( which all use the bass clef in their lower and middle ranges , and in their extreme high ranges , the treble clef as well ) .
simplified: The bass clef is normally used for the left hand in piano music . Low instruments like the cello , double bass and bassoon mostly read from the bass clef .