The guitar used by blues legend ROBERT JOHNSON could sell for more than $5.4 million (GBP3 million) when it goes on sale on a memorabilia website. Johnson - dubbed the father of rock 'n' roll - played the Gibson L1 acoustic instrument on his only two recording sessions in 1936 and 1937. The 29 songs it produced are said to have inspired a host of subsequent rock stars including Led Zeppelin, THE Rolling Stones, Bob Dylan and Eric Clapton, who released an album of Johnson covers in 2004. They have all been tipped as potential buyers of the classic guitar, and could boost the staggering price tag on internet site Moments In Time even higher if a bidding war ensues. Johnson died in 1938 aged just 27 - allegedly having been poisoned by a lover's jealous husband.