Houdah Software today announces Chord Board 1.0 for iPhone and iPod touch. The Chord Board is a slide rule that displays the notes necessary to from chords. More than a chord dictionary, Chord Board is a means of reference for musicians, singers, songwriters, choirs, composers and arrangers. It was designed and published in 1979 on the island of Oahu, Hawaii. Martin Samuel and Houdah Software have now turned the acclaimed classic into an iPhone / iPod touch application.