The viola da gamba is a bowed 7-stringed instrument invented in Italy. It comes from a series of instruments known as viols. The same techniques can be applied to the viola da gamba as is a cello.
A viola da gamba's tuning is A1, D2, G2, C3, E3, A3, and E4. Variations of the viola da gamba have different tunings. This instrument is also fretted like a guitar.
This instrument is not transposed and uses the bass clef. However, it's able to use tablature, which is sheet music in the form of fingerings.
A group of viols is called a viol consort, and certain baroque groups use viols.
That's all for the viola da gamba. See you next time!