A kontra (, 'three-stringed viola') is a Hungarian, Czech, Polish, Romanian, Slovak and Romani instrument common in Transylvania.
The kontra can be constructed new, but is most often a classical viola which has undergone several organological changes, for example, thinning ("regraduating") the top, back, and sides to increase the amplitude, and flattening the bridge, which allows the player to sound all three strings at once in order to produce chords. In addition, unlike the viola, they are only strung with three strings. Sometimes they have frets (like a guitar) to help with playing chords in tune.
The kontra is tuned like a viola, though lacking its low C string: G3-D4-A4. Frequently, the A string is replaced with a second G string tuned to A3, a major second above the g, in a form of re-entrant tuning.
Due to the flattened bridge, the standard method of play is to play double stops and three-note chords and let the fiddle play melody lines. Rarely, parts of the main melody are also played on the top or the bottom string. (The middle string can't be bowed due to the flat bridge)
The kontra has a defined role within dance band music. Its range lies between that of the fiddle or Vioara cu goarnàon the high-end and the double bass on the low-end. Many Hungarian and Romanian bands also feature the cimbalom or citera, clarinet, accordion, and ÃÂtà Âgardon or cello.