There is no evidence to show that either Newton or Cowper wrote any music to accompany the hymns. It is assumed that they were initially sung to any suitable tune that fitted the metre (rhythm), most probably to 16th or 17th century metrical psalm tunes. Subsequently, individual tunes have become linked to specific hymns from the Olney books. For example, the tune "Austria" (originally Haydn's "Gott erhalte Franz den Kaiser", an Austrian patriotic anthem) is associated today with the hymn "Glorious Things of Thee Are Spoken", just as "New Britain", an American folk melody believed to be Scottish or Irish in origin, has since the 1830s been associated with "Amazing Grace". This hymn's Scottish or Irish melody is pentatonic and suggests a bagpipe tune; the hymn is frequently performed on bagpipes and has become associated with that instrument.