London, August 15 : Sales of Michael Jackson's hit songs have been soaring since the sudden death of the star on June 25.

British music publisher Chrysalis Group said Jackson's untimely death led to an "extraordinary surge in the sale of his work."

These include the singer's popular tracks such as "Thriller", "Rock With You" and "Off The Wall".

But Andy Mollett, chief financial officer, said that the effect of Jackson's death on profits was difficult to determine.

"We would have got royalties anyway with his 50 live shows at the O2," Sky News quoted Mollett as saying.

"I can''t say how much we will make from this as there is always a lag from when one of our songs are played and when we get paid," Mollett added. (ANI)