A few days ago Aarnoud de Groen played a wonderful live-concert on you-tube, where he introduced this beautiful piece by the Nigerian composer Fela Sowande, who lived from 1905-1982 and studied in England.
Here a link to the live-concert. The Pastourelle begins at 0:35:35
, but I recommend to view the complete concert!
Thank you, Aarnoud for this fine detection!
Here are some informations about the composer, his works and the scores: