Jay Z told a jury Wednesday that he believes he has a valid license to use Arabic music featured on his 1999 hit "Big Pimpin'" that is now the subject of a copyright infringement trial.<br />The rap superstar spent roughly 90 minutes testifying in a federal courtroom Wednesday, recounting his life, his successes and the creative process that led him and music producer Timbaland to create "Big Pimpin'," which was his first major hit single.<br />Jay Z and Timbaland are being sued by an heir of Baligh Hamdi, an Egyptian composer who created the 1957 hit "Khosara Khosara" that has elements featured in the rapper's hit.<br />The rapper, whose real name is Shawn Carter, used one of his old CDs - introduced into evidence by a lawyer for Hamdi's family - to illustrate his point.<br />Lawyers for Carter and Timbaland, whose real name is Timothy Mosley, told jurors on Tuesday that Hamdi's family had been repeatedly paid for the use of "Khosara Khosara."