The singers are basically five with three more added when a double quartet is needed.

The album features a double quartet, one in each stereo channel.

There are eight musicians in a double quartet or an octet.

The Double Quartet is more emotionally ambitious, but, in the long run, less interesting.

Composizione 7, for double quartet and chamber orchestra.

One of these groups was "The Double Quartet."

An auditioned chamber orchestra consisting of a double quartet, and a non-auditioned full orchestra.

Master Furlo had a double quartet among his miners who sang most evenings, at the drop of a hat, as Mallan put it, grinning.

He led a double quartet, consisting of his working group of trumpet, saxophone, bass and drums plus a string quartet.

The master drummer is leading his richest group, the double quartet, pairing up his regular group with a string quartet.