Julian Lennon has sold a share of his financial stake in Beatles songs co-written by his late father to a New York music publishing firm. Financial terms were not disclosed Friday, but Primary Wave Music Publishing said its acquisition represented a significant share of Julian Lennon's economic interest in the songs. "I felt it was the appropriate time to take on a partner for both my interest in my father's legendary music and for my future music endeavors," Julian Lennon, 44, said in a statement. The deal does not apply to any of John Lennon's solo compositions. Songwriters and their music publisher share royalties when a song is licensed for use in a film, television commercial or other use.