Martin Harold "Marti" Frederiksen (born July 1, 1962) 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.