It's a tuba solo with piano accompaniment. The ideas came to me one afternoon while I was doing something in the garden. I realised I had not yet written a piece featuring my own instrument and I was looking into the depths of a pond when I thought I'd better get busy.
It opens with a quasi cadenza in the style of a Bach partita and this contains all of the material that follows. when the piano joins in it holds a chord progression that sounds a little 'churchy'. but then it begins a conversation with the tuba. which becomes progressively more complex. This leads to a fugal idea, again based on the cadenza. The piano pontificates gently while the tuba listens patiently, butting in occasionally.
Then the piano introduces a march-like motif which is taken up by both instruments. There follows a bit of a contest between them, using elements of the fugal theme and the cadenza. Some of it is discordant, but then they find some common ground and the dialogue moves to a satisfactory conclusion, reprising ideas from the opening, but with the tuba more assertive. After a final reprise of the fugal motifs, the tuba decides he has had enough and settles the argument with a deep thought!