All the instruments and the voices were done in Spain, bar the brass arrangements that were recorded later in London with Peter Thoms on trombone, Gary Barnacle on saxophone and Enrico Tomasso on trumpet.

Budgie conceived the brass arrangements with trombonist Peter Thoms and saxophonist Gary Barnacle, they had previously worked with a horns section six years earlier on the "Right Now" single.

While being in Spain, photographer Anton Corbijn joined the band to shoot several pictures for the CD album booklet and the sleeves of the two singles.

[4] Simon Reynolds of Melody Maker stated that "Boomerang abounds with scarcely anticipated brilliance", qualifying it as "inventive and invigorated music".

They wrote: "With a lot of varied percussion and bursts of languorous brass, the Creatures weave a captivating album with baroque breaths.

A mixture of strength and grace, moist heat interspersed with refreshing flashes, Latin-tropical emanations tamed by a rigid English phlegm.

"[9] Libération praised it saying: "the use of space sometimes reaches perfection” on this record in which “we discover in Siouxsie a warmth, a feeling all in curves with a dark suavity, that we didn't suspect".

[10] In a retrospective review, AllMusic hailed Siouxsie's performance, saying: "Sioux's singing is some of her best both in and out of the Banshees, still retaining the shadowed mystery that she makes her own while drawing on an interesting range of styles".