FOUR of Britain’s biggest karaoke firms face ruin after being sued for infringing copyright in the US. They must cough up hundreds of millions in damages after failing to pay royalties on versions of hits by acts including The Beatles and Oasis. UK firms SBI Global, Mr Entertainer, Zoom Entertainments and Music Factory re-create hits without the vocals and sell them on. But while they paid royalties on sales in the UK and Europe they did not have permission to sell in the US, a court ruled. They sold most of their tunes in the States via the now-closed Canada-based website TriceraSoft. But a judge in Nashville, Tennessee, has now ordered the four Brit firms and TriceraSoft to pay a total of £527million in damages to record labels Sony and EMI — along with £870,000 in costs between them. Insiders said the case, which began in 2015, could bankrupt the firms. Last night Mr Entertainer boss Gary Oates, 34, from Guildford, Surrey, called the decision “farcical”. But he refused to say anything else and plans to appeal.