She has supported many causes over the years, including HIV/AIDS care and research. Her cover of Cole Porter's "So in Love" (from the Broadway musical, "Kiss Me, Kate"), appears on the "Red Hot + Blue" compilation album and video from 1990 (a tribute to Cole Porter to benefit AIDS research and relief). Her 2010 greatest hits album, "Recollection", also includes this cover of "So in Love." Lang also recorded the song "Fado Hilário", singing in Portuguese, for the 1999 Red Hot AIDS benefit album "", a traditional fado from Portugal.