The Transpos-O-Matic Music Sliderule is a handy aid to musicians, students, and teachers. Easy and portable, the user can transpose melodies and chords in an instant. The devise also includes helpful musical tables.

musical, music, notation, sliderule, slide rule, transpose, chord, chord spelling, key, key signature, major, minor, chart, table, scale, chromatic, diatonic, transpos-o-matic, transpose-o-matic, transposomatic, transposing, transposer, musician, student, teacher, aid, tool, help, helper, device, gadget, thing, gizmo, buy