Many Hollywood stars have attempted the crossover from actor to musician, but what's more surprising is how many, albeit not known for their singing ability, have recorded songs for film soundtracks.
Whether it's Colin Farrell belting out a country track or Sylvester Stallone crooning a smooth, jazzy number, you'll be amazed who has contributed to Hollywood soundtracks.
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Take a look through the clips in the gallery above. Let us know in the comments below about any other actors-come-soundtrack-singers you know about.