The piece was composed for Virgil Blackwell, who played the bassclarinet at the first performance. The composer states: “Its title comes from the fact that, unlike the other woodwind instruments, the clarinet overblows at the twelfth, a large interval that forms the basis of much of this composition.”
| Instrument (fx guitar, sang m.m.) | Bas Klarinet |
| Sideantal | 6 |
| Media (fx Bog, CD, DVD m.m.) | Bog(softcover, hęftet) |
| Publisher/Producent | Boosey and Hawkes |
| Bidragydere | Carter, Elliott(Composer) |
| ISBN | 9781423410379 |
| ISMN | 9790051104437 |
| UPC | 884088054632 |