Along with expansive anniversary boxed sets, the most welcome recent trend in album reissues is to reconfigure live albums so they present the concert whole, uncut, as they happened. Which is what fans of Jimi Hendrix’s 1970 concert collection Band Of Gypsys are getting with Songs For Groovy Children: The Fillmore East, a four-CD, 8-LP, 43-track digital collection that presents both that legendary show and three others uncut for the first time.