I have this bassoon piece in my head and I cannot work out what it is. It is for solo bassoon with piano accompaniment in D minor. The bassoon melody starts in 4/4 like so
Later there is a section in D flat major. I would be very grateful if someone could tell me what this piece is called and who wrote it.
Edit: Myself playing the part I remember: https://drive.google.com/file/d/0B_J72OXGx6xSZkE0UF9CbVBKLVk/view?usp=drivesdk