montrose appeared on sammy hagar's solo album "marching to mars" (1997) along with original montrose members bassist bill church and drummer denny carmassi on the song "leaving the warmth of the womb". the original montrose lineup also reformed to play as a special guest at several sammy hagar concerts in summer 2004 and 2005. montrose also performed regularly from 2001 until 2011 with a montrose lineup featuring keith st. john on lead vocals and a rotating cast of veteran hard rock players on bass and drums. in 2011, montrose formed the 'ronnie montrose band' with randy scoles on vocals, dan mcnay on bass, and steve brown on drums, playing music from his entire career, including both montrose and gamma songs. this lineup was captured in his final released work, the concert dvd "ronnie montrose: live at the uptown".