Because Vermeersch soon grew tired of the constraints imposed by sheet music, he started his own ensemble X-Legged Sally.
[1] As a composer, Peter Vermeersch has his own place among the long list of contemporary Belgian composers, although, due to his lack of formal training and his involvement with pop music, he doesn't necessarily fit in with the likes of Wim Henderickx, Luc Brewaeys or Boudewijn Buckinx.
From his early career, Peter Vermeersch has composed music for modern dance productions of renowned Belgian companies such as Rosas and Ultima Vez.
Apart from these, various ensembles have commissioned compositions, such as a string quartet for Walpurgis and the tone poem 's Nachts brede opklaringen for the Spiegel Strijkkwartet.
The grand big-band opera Heliogabal was written for the Ruhr Triennale and performed by the Flat Earth Society.