Just one in 20 of the UK's best-selling tracks in 2012 were both soley written and performed by the same act, Music Week research shows.
In the Official Top 100 Singles of 2012, 90% involved at least some additional songwriting to the recording act, whilst 5% were cover versions.
[READ: Music Week's 2012 songwriters analysis in full through here]
That left just five of the top 100 sellers penned by the artist/s alone - including The Lumineers (pictured, Ho Hey), ...
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