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The Blue Grassy Knoll is a bluegrass band formed in 1996, consisting of Gus Macmillan (banjo), Philip McLeod (accordion, Mandolin, Cello), Stephan O'Hara (Violin) Alex Miller (Double Bass) and Simon Barfoot (Guitar, vocals). Based in Melbourne, they began playing in clubs and pubs in 1996, and at the end of the year were invited to the Woodford Folk Festival in Queensland. They released the album Thomas Murphy's Stag Party in 1997. After this they began performing around Australia as well as internationally, firstly at the Edinburgh Fringe festival in 1999 and again in 2000.

Their performances involved playing a live soundtrack to accompany silent screenings of Buster Keaton films. Their fast and frenetic music would match the events on screen with precise timing. They would also provide occasional sound effects such as gunshots. Films they accompanied included Cops and Our Hospitality. Unlike modern cinema experiences, they encouraged audience participation. At the beginning of a performance the audience would be invited to cheer for the heroes and boo the baddies.

Most of their appearances in Sydney were at the Valhalla cinema in Glebe (which has since closed). Outdoor screenings also took place at the Sydney Opera House forecourt and Martin Place.

They still perform, and most recently appeared at the Sungapore Arts Festival in June 2006 . Their last band performance in Sydney in 2004 was at The Vanguard in Newtown. Among their repertory was a rendition of the music being played in a scene in the film Star Wars, when Luke Skywalker and Obi-Wan Kenobi entered the bar in Mos Eisley on Tatooine.