Smash hit Uptown Funk is in hot water over claims of copyright infringement.

Mark Ronson and Bruno Mars have a lawsuit on their hands saying their tune sounds extremely similar to funk group Collage's 1983 single Young Girls.

Mark Ronson and Bruno Mars accept award onstage during the 2015 MTV Video Music Awards at Microsoft Theater on August 30, 2015 in Los Angeles, California. Photo / Getty
Mark Ronson and Bruno Mars accept award onstage during the 2015 MTV Video Music Awards at Microsoft Theater on August 30, 2015 in Los Angeles, California. Photo / Getty

According to Pitchfork, the band Collage claims "many of the main instrumental attributes and themes of Uptown Funk are deliberately and clearly copied from Young Girls."

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This includes "the distinct funky specifically noted and timed consistent guitar riffs present throughout the compositions, virtually if not identical bass notes and sequence, rhythm, structure, crescendo of horns and synthesizers rendering the compositions almost indistinguishable if played over each other and strikingly similar if played in consecutively," the lawsuit continued.

(L-R) Producers Mark Ronson, Jeff Bhasker, and recording artist Bruno Mars accept the Record Of The Year award for 'Uptown Funk' onstage during The 58th GRAMMY Awards. Photo / Getty
(L-R) Producers Mark Ronson, Jeff Bhasker, and recording artist Bruno Mars accept the Record Of The Year award for 'Uptown Funk' onstage during The 58th GRAMMY Awards. Photo / Getty

Reps for Mark Ronson and Bruno Mars have not responded to requests for comment.

TMZ have also come out saying Collage added that Mars and Ronson admitted in interviews to being inspired by the Eighties Minneapolis and electro-funk scenes that Collage belonged to.

(L-R) Singer Bruno Mars, musician Mark Ronson and singer Lionel Richie attend The 58th GRAMMY Awards at Staples Center on February 15, 2016 in Los Angeles, California. Photo / Getty
(L-R) Singer Bruno Mars, musician Mark Ronson and singer Lionel Richie attend The 58th GRAMMY Awards at Staples Center on February 15, 2016 in Los Angeles, California. Photo / Getty

Collage are seeking unspecified damages and profits.