[2] Johnson joined David Millar, Mark and Tim Gane, and Carl Finkle to form the band Martha and the Muffins in 1977.
[3] The band, later known as M + M, released an international hit single with "Echo Beach", with Johnson as lead singer.
[4] In 1985, she and her husband and bandmate Mark Gane were presented with a CASBY award for their production work with the group.
[6] In 2001, Johnson was diagnosed with Parkinson's disease, but continues to perform and to raise awareness in her shows.
[8] In 2016, Johnson participated in the Rock Steady boxing program, which promotes fitness for those living with Parkinson's disease.