I have been asked by a vocalist at my school to lead a jazz ensemble in a rendition of Feeling Good. Right now, I am torn between either playing the double bass or the piano for the song. I feel that on the double bass I would give the band a strong foundation in following along with the singer. On the other hand, there are no jazz piano players in my school's music department. Only a classical pianist. His jazz chops aren't that good, so I feel I could provide the right improvisational feel I want in the piano playing. I do have another bass player I could call up in this situation. Thanks for any input.