"Heidelberg’s quasi-operatic vocals are entrancing, and her control of volume and tone, especially at the delicate end of her range, is breathtaking. The echoes span John Lydon to Thomas Adès"
- Matthew Wright , The Arts Desk
""Heidelberg is a fine vocalist: aggressive one moment, tender the next...attitude in spades, a Slits for the new jazz age.""
- All About Jazz
Heidi Heidelberg is an anarchic soprano, an improviser, musician and a composer, bringing together classical coloratura, jazz scat, beatbox and rock vocal influences. One half of award-winning art rock/postjazz duo Witch 'n' Monk, she is a fiercely creative performer and composer.
A gutsy electric guitarist and master of the loop pedal she has written music for award-winning films and theatre, and collaborated with a number of innovative artists. Her current projects include fluid form duo project 'Witch 'n' Monk', work as a soloist, Philipp Ruttgers' North Sea Jazz commission project Twists of HC Andersen and collaborations with various composers, improvisers, cinematographers and musicians. Witch 'n' Monk have released the critically-acclaimed 'Fulafalonga EP' , 'We Are Peering Over'  and the eponymous Witch 'n' Monk [2020, Tzadik] which was awarded the prestigious Preis der deutschen Schallplattenkritik in the Grenzgaenger category and it was named 'Contemporary Album of the Month' by The Guardian. With Witch 'n' Monk Heidelberg has composed for avant-garde performance art (collaboration with award-winning cinemtographers Yuri Priondi & Ines von Bonhorst) and for radio plays (Deutschlandfunk Kultur).
Heidelberg has appeared live at the London Jazz Festival, North Sea Jazz Festival, Bimhuis, La Cigale, Royal Festival Hall, Union Chapel, Manchester Jazz Festival, Dunkers Kulturhus, InJazz Festival, LantarenVenster, Paradox Tilburg, Live on BBC Radio 3, Umea Jazz Festival, So What's Next Festival, among others. But she also enjoys more DIY and intimate performance contexts where experimentation can thrive.
Heidelberg's other collaborations include work with celebrated composer Lina Lapelyte on 'Candy Shop' which has toured the UK, including performances at Glasgow Counterflows festival and the Queen Elizabeth Hall, with celebrated composer and multi-instrumentalist Oene van Geel. She has also featured in radio plays and productions such as 'Common Wealth' (Deutschlandfunk Kultur) and 'Uberredung' (Hessischer Rundfunk).