Intermediate. Spectrum for Trumpet is a unique and fun book about what colours may actually sound like. Whilst this may seem like a far out concept, there is actually a medical condition whereby people who have this condition can actually hear what colours sound like! Every time they see a colour they hear a particular note or chord. With this idea in mind, Spectrum was composed as a series of pieces about colours and what these may sound like. Not only is this an interesting concept but the pieces themselves provide the trumpet player with melodic and enjoyable repertoire.