Sentence:  Hendricks had Billy Mitchell , tenor sax ; Pony Poindexter , alto sax ; Jimmy Witherspoon , blues singer ( and a good one ) , and the Ike Isaacs Trio , which has done such wonderful work for two afternoons now , <WSD>helping</WSD> him with the musical examples . 
Meaning of the word marked with <WSD> tags:  give help or assistance; be of service