There's something weightless about the work of Monica Vasconcelos, the UK-resident singer from Sao Paulo who launched the Candid record label's week-long showcase. As Meninas (it means "the girls" but there are two honorary boys) is the quartet she leads as an alternative to her orchestral band Nois. The more exposed context highlighted the subtleties of her understated manner and also enhanced the sympathetic understanding Vasconcelos has with her regular saxophonist, Ingrid Laubrock.

Antonio Carlos Jobim often surfaced, but Vasconcelos has a profound grasp of Brazilian musical traditions that allows her to avoid a greatest hits of such superstar composers in favour of equally good, overlooked songs. On uptempo pieces, Vasconcelos would often play percussion in support of her drummer Chris Wells, but her voice has such a light, dancing quality (and a quick, clipped articulation like a string of vocalised punctuation marks) that she blends into the music's breezy shuffle as if she were a rhythm instrument herself.

Ingrid Laubrock shadowed Vasconcelos closely on saxophones, sounding like a confection of many contemporary jazz models on soprano, and at her most lyrical on alto. She plays exquisitely and with an atmospheric sense of space and delay reminiscent of Lee Konitz. That sound, and Ife Tolentino's lapping-waves guitar, allowed Vasconcelos's already airborne music to float all the more freely.

The festival continues with Stacey Kent (tonight), Olga Konkova and David Jean-Baptiste. Box office: 020-7439 8722.