Higurashi no naku koro ni / When They Cry : music identification

I’ve been listening to the anime soundtrack, searching for a very particular jazzy/melancolic tone that is sometimes heard throughout the first and second season of Higurashi no naku koro ni / When they cry. It is very unique as there is only one instrument, – a brass – and no singers or anything. However, I have been unable to find it on YouTube or any other sites yet.
Does someone here knows if there is any recorded music featuring this part and where/how I could find it online ? Thank you very much !