Oliver Waespi pursues a wide range of musical interests, which leads him to composition projects in various areas. This also creates references to other art forms. Works such as "Volatile Gravity" for Jojo Mayer and the Basel Sinfonietta, "Viaduct" for the BBC Philharmonic Orchestra or "Hypercube" for the Paris Brass Band can be heard as musical interpretations of urban landscapes and architectures. A project for the Ensemble TaG led to the combination of music with contemporary dance. Various pieces have references to poetry, such as "Flut" for the BBC Singers, "Nachtferne" for the Berne Chamber Orchestra, "Azur" for l'art pour l'Aar, "Weisser Atem" for the Brodsky string quartet, or "Ad Astra" for the Nouvel Ensemble Contemporain.
Some of Oliver Waespi’s works are reflections on folk music and early music. These include "As If A Voice Were in Them", "Traversada" or "Audivi Media Nocte". The latter piece brought him worldwide recognition among leading ensembles and reflects Waespi's approach of combining individual, groove-related rhythms with the spatiality of orchestral structures. Other examples in this line of thought are pieces such as the "Divertimento" for the Swiss Wind Band Convention, "Out of Earth" for the symphonic wind orchestra Aulos or "At the Crossroads", commissioned by the Jena Philharmonic and the Brass Band BlechKlang. Several solo concerts complete Oliver Waespi’s body of work, including concertos for guitar and flute, harp and piano, french horn, trombone, euphonium and tuba.
For his music, Oliver Waespi received numerous awards. These include the International George Enescu Composition Prize in 2003, the London Fellowship awarded by the Landis and Gyr Cultural Foundation in 2005/2006, a prize at the Uuno Klami Composing Competition in Finland in 2009, composition grants of the Swiss Arts Council Pro Helvetia and the Dutch Eduard van Beinum Foundation, the Composition Prize of the Swiss Federation of Orchestras (EOV) in 2011, the NBA Revelli Award in the USA in 2013, the Stephan Jaeggi Prize in 2014 or the International BUMA Brass Award in the Netherlands in 2015.
Noch erstaunlicher als die Soli war aber die Tatsache, dass es das Orchester auf überzeugende Art und Weise schaffte, sich mit den verschiedenen Grooves Mayers zu synchronisieren. Die daraus resultierende Musik war geladen mit Energie, die das geistige, emotionale und körperliche Potenzial der aufeinandertreffenden Kräfte in sich stimmig vereinte. So macht Klassik und Pop Spass – und definitiv Lust auf (noch) mehr Abweichen von der Normalität.»