| 1 | Soon the duet will become a trio. | |
| 2 | This classic piece features a duet between a coloratura soprano and and a mezzo-soprano. | |
| 3 | Frank and I gawked, like a duet of wide-mouthed frogs. | |
| 4 | The idea is for a "duet system, " where a video expert teaches in tandem with the classroom' s own teacher. | |
| 5 | Researchers say the calls become layered atop one another, almost like a duet. |