Sentence:  This would tax the strongest of friendships, and the Kinks were more musical partners than friends or even brothers in Ray and Dave's case. Furthermore, Ray, the musical leader, was frequently aloof, moody, or just reticent, hardly qualities of a solid <WSD>road captain</WSD>. 
Meaning of the word marked with <WSD> tags:  A leader who steers or directs a group.