Guitarists often use the technique to play arpeggios at high speed. A common fretting shape is the one- or two-octave stacked triad. In scalar terms, this is the first (tonic), third (mediant) and fifth (dominant) of a scale, played twice, with an additional tonic added at the high end. For example, an A minor stacked triad is A-C-E-A-C-E-A. When the guitarist plays such a series of notes quickly up and down as an arpeggio, the phrasing sounds typical of pianos and other instruments more associated with such arpeggios. Unlike pianos, woodwinds, and many other instruments, the guitarist can change key by moving the same arpeggio shape up and down the fretboard.