The Bass Octave - The ideal accompaniment for the Wing. The Bass Octave instrument creates a rich canvas of low tones for the melodic Wing instrument to play over. With four corresponding scales to the Wings, the Bass Octave instrument is comprised of six low notes in the pentatonic scales of either G major, D minor, C major or A minor. The notes are made with 2 inch wide aluminum bars that are resonated by 2 1/2 inch square tubes, giving these low tones remarkable projection for their size and cost. Price includes one mallet, an additional mallet is $22.