du·et 
(d-ĕt, dy-)
(d-ĕt, dy-)n.
1. Music
a. A composition for two voices or two instruments.
b. A group of two singers or two instrumentalists.
2. A pair.
intr.v. du·et·ted, du·et·ting, du·ets
To perform a duet.
[Italian duetto, diminutive of duo, from Latin, two; see dwo- in the Appendix of Indo-European roots.]
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