Definition: 4 stringed guitar-like plucked instrument from China with a pear shaped body. In the literature as far back as 2000BC. The name refers to the forward and back picking technique. Read the full Other Fretted Instruments FAQ Page.
Two row chromatics have the rows tuned a semitone apart. The first key quoted is the lower. B/C is most common but we do sometimes have C/C# and C#/D. Chromatic tuning is normal in Ireland and popular as well in Scotland.