To dream of hearing a duet played, denotes a peaceful and even existence for lovers.
No quarrels, as is customary in this sort of thing.
Business people carry on a mild rivalry.
To musical people, this denotes competition and wrangling for superiority.
To hear a duet sung, is unpleasant tidings from the absent; but this will not last, as some new pleasure will displace the unpleasantness.