Multi-course harp
A multi-course harp is a harp with more than one row of strings. Harps with two rows are called double harps; harps with three rows are called triple harps. A harp with only one row of strings is called a single-course harp.
Diatonic double harps
A diatonic double-strung harp consists of two rows of
Diatonic double harps can also be tuned in octaves to allow for an extended range on small instruments.
Chromatic double and triple harps
Chromatic double and triple harps have one row of strings that is tuned pentatonically to allow for chromatic playing. These harps exist both as parallel chromatic harps or as cross-strung harps.
Parallel chromatic double and triple harps
These harps have the strings strung in parallel, and are not to be confused with inline chromatic harps.
A triple harp features three rows of parallel strings, two outer rows of diatonic strings, and a center row of chromatic strings. To play a sharp, the harpist reaches in between the strings in either outer row and plucks the center row string. Like the double-strung harp, the two outer rows of strings are tuned the same, but the triple-strung harp has no levers.
This harp originated in Italy in the 16th century as a low headed instrument, and towards the end of 17th century it arrived in
Cross-strung harps
Cross-strung harps have two rows of strings that intersect in the middle.