The 1960s vocal group legend brings her annual Christmas show to The Cabot Dec. 1. Before there was Lisa Fischer, there was Darlene Love, possessor of one of the greatest voices in popular music (#84, according Rolling Stone’s 2010 list of the 100 Greatest Singers). The two have lot more in common than having area gigs coming up. Both have sung on recordings by Aretha Franklin, Dionne Warwick, and Luther Vandross. Both were featured in the 2013 documentary “20 Feet from Stardom,” whose numerous honors included an Academy Award, a Grammy, and an NAACP Image Award. Furthermore, both have peculiarly few albums to their own credit given their voluminous work for others.