Since appearing in the original production of Rent in 1996, Idina Menzel's career has gone from strength to strength. From originating the role of Elphaba in Wicked to singing Let It Go from Frozen, she's now undoubtedly one of the biggest names in the business. As befits her superstar status, she's heading out on a truly massive 2015 World Tour.
There may have been other "retro" rock acts before him, but Lenny Kravitz was one of the first to not be pigeonholed to a single style as he touched upon such genres as soul, funk, reggae, hard rock, psychedelic, folk, and ballads over the years. His latest album, Strut, was released in 2014 and marks the rocker's tenth studio release!