Is this an opus? Opus vindictus?
By the way....... our Freeper friend One Who knows (OWK) educated us on the subject long ago in the dim past. Opus is singular. On Free Republic, one generally has but one opus.
If there are are more than one Opus gathered together, it becomes an opera.
Opus is singular, Opera is plural.
Unless they are sufficiently small then it's an Operetta... ;-)
Until it hits Broadway, then it's a Musical.