In the key of low A. The Hohner Marine Band Thunderbird is tuned one octave lower than standard harps, and it opens up previously unknown creative possibilities for the player to discover new worlds of tone with the meanest, fattest low-pitched sound around. The Thunderbird's unique cover design is based on an innovation pioneered by Joe Filisko. The front of the bottom cover is raised at the lower end and tapers off towards the high end. This gives the draw reeds sufficient space to vibrate freely at even the lowest pitches without striking the cover, thus eliminating reed rattle. The Thunderbird boasts a full, powerful sound unparalleled among low-pitched harmonicas. Its revolutionary construction also incorporates the patented laminated bamboo comb first used in the Crossover.