Martin Harold "Marti" Frederiksen is an American songwriter, record producer, and musician. He writes and produces music primarily in rock, country, and pop. He is best known for his work with many artists and bands including the Struts, Aerosmith, Gavin Rossdale, Carrie Underwood, Buckcherry, Daughtry, Ozzy Osbourne, Mötley Crüe, and Faith Hill. He's also well known for performing the lead vocals for the fictitious band Stillwater in the movie Almost Famous.

Almost Famous is a 2000 American comedy-drama film written and directed by Cameron Crowe, starring Billy Crudup, Frances McDormand, Kate Hudson, Patrick Fugit, and Philip Seymour Hoffman. It tells the story of a teenage journalist, played by Fugit, writing for Rolling Stone magazine in the early 1970s, touring with the fictitious rock band Stillwater, and writing his first cover story on the band. The film is semi-autobiographical, as Crowe himself was a teenage writer for Rolling Stone.