Conversation so far:
what did sarah vaughan do from 1943-44 with earl hines and billy eckstine?
Eckstine quit the Hines band in late 1943 and formed his own big band with Gillespie, leaving Hines to become the new band's musical director.
how did that turn out?
Vaughan accepted Eckstine's invitation to join his new band in 1944, giving her an opportunity to develop her musicianship with the seminal figures in this era of jazz.

Question: did she develop her musicianship?
Self-contained rewrite: Did Sarah Vaughan develop her musicmanship after joining Eckstine's new band in 1944?