available on all digital platforms (Spotify, Apple Music, Amazon Music etc) and Bandcamp.

19.5 by Donald Bousted with duo Contour (2021)

BUY 19.5

Read about 19.5

Time Dreaming by Stephen Altoft (2021)

Time Dreaming Web Page and Programme Notes

Purchase on Bandcamp

To order any of the following publications please email:
info.microtonalprojects (at)
Shipping will be arranged from Germany using the cheapest option. If you are based outside of Europe we recommend purchasing the digital albums



“Stephen Altoft is an explorer who draws maps of musical terrain with his trumpet. The title track, his own composition Rasp, is a slow motion expansion from a breathy hiss to an intense broken buzz … The logic of the progression is as stark as the material itself: a fearless opening statement … announcing to the listener “this is what I work with.” (Max Christie, The Whole Note)

Stephen Altoft’s second solo CD in which he exclusively plays music written for his unique 19-division or 19 note-per-octave trumpet.


UK MicroFest 2 Double CD

A double CD documenting UK MicroFest 2 which was held in the UK in 2007. Music by Gorton; Herriott; Desorgher; Bryan; Salinas; Visser and Fonville.


Or purchase digitally here on Bandcamp


An astonishing CD from virtuoso German recorder player Andreas Böhlen. Music by Peter Eötvôs, Maki Ishi, Stuart Saunders, Donald Bousted and Wolfram Graf.

SPECIAL OFFER: €12 instead of €16, 2 copies left

A Journey Among Travellers

“a series of tiny masterpieces. Wonders on so modest a scale tend to be in short supply these days.” The Wire

9 Quarter-Tone Pieces by Donald Bousted for two recorders, performed by Kathryn Bennetts and Peter Bowman


Or purchase digitally here on Bandcamp


The Microtonal Trumpet Study Booklet

Score of 24 Microtonal Studies in 19-, 24- and 48-divisions of the octave by Donald Bousted, fingered and edited by Stephen Altoft.

These studies form the centre piece of an extensive investigation into the microtonal possibilities of the trumpet by trumpeter Stephen Altoft and composer and microtonal theorist Donald Bousted. Recordings of the studies are available here. The scores are now only available as a PDF.


Enquiries: info.microtonalprojects (at)