The 542 Golden Melody diatonic harmonica is a long-time Hohner staple. It is the only harp they produce that uses "Equal Temperament" tuning. This means that all notes are tuned exactly true to A440 values (other, "Just temperament" tuned harps are tuned with individual notes having wee variances to make the chords sound true). It's streamlined shape and distinctive red plastic comb give it a decidedly modern look and a bright, even tone.