Alyson Hannigan 1989, her first regular role on a TV series came when she was cast in the short-lived ABC sitcom "Free Spirit". As a teenager, Hannigan babysat for the children of her future "How I Met Your Mother" costar, Bob Saget. In 1997, Hannigan was cast to play Willow Rosenberg, Buffy Summers' best friend, on the television series "Buffy the Vampire Slayer". The show became a success, and Hannigan gained recognition, subsequently appearing in several films aimed at teenaged audiences, including "American Pie" (1999), "Boys and Girls" (2000), "American Pie 2" (2001), and "American Wedding" (2003). She also had a guest
Music in Buffy the Vampire Slayer and Angel of the show. The album also features the songs, "Strong" and "Treason," the two songs the band played during their appearance on the show. Sarah McLachlan's music is used twice on "Buffy" at two key moments (finales of Season 2 and 6). Music in Buffy the Vampire Slayer and Angel The use of music was a key component in the fictional Buffyverse established by the TV shows "Buffy the Vampire Slayer" and "Angel". Many actors of both series are gifted and professional singers/musicians (Anthony Head, James Marsters, Amber Benson, Andy Hallett and Christian Kane to just cite a few). The