The van Dijk sisters were in their early teens when the collaboration with Caroline started, and were therefore better able to pick up foreign languages.

Although the girls have been singing in English and occasionally in French, the Treble language still is an integral and important part of their songwriting and performances.

Backed up by a group of session musicians they show the many different styles Treble has mastered, ranging from ballads to uptempo rock songs.

On stage the three girls are accompanied by a three-man live band: Olaf Fase (drums), Emanuel Platino (bass) and Willem Philips (guitar).

His involvement lead to a much more coherent sound and the inclusion of the Fleetwood Mac song Crystal, which also was produced by Keith Olson in its original form.

The band returns to familiar water when they went on a theatre tour (Omne trivium perfectum) and a full festival agenda.

Djem and Niña van Dijk have both enrolled in the Amsterdam Conservatorium to sharpen their musical skills reducing their participation in Treble.