Cold weather got you down? Omnivore Recordings is heating things up with a pair of gems – hidden no more – due on March 11. The label will bring a lost Memphis classic from artist Sid Selvidge (and Big Star producer Jim Dickinson) to CD for the first time in over two decades, along with a funk-filled fusion excursion courtesy of Bayeté, a.k.a. Todd Cochran (writer of Santana’s “Free Angela”). Though born in Mississippi, singer-guitarist Sid Selvidge was a fixture on the Memphis music scene