I’ve committed quite a number of changes recently in Opycleid, my Python package for doing transformational analysis. Among those, you have the possibility to compute R- and L-classes of elements (in the sense of the Green’s relations) in any monoid, its cosieves, its automorphisms, etc. In fact, by some points, it looks more like a computer algebra package…
And if you want to hear the real instrument,
here’s an ophicleide concert:
And another one:
Having an ophicleide at home, I can guarantee you that playing in tune is anything but guaranteed (unfortunately, that’s inherent to the design of the instrument itself)… so the technique and tuning in these video is simply amazing !