By Stephanie Nebehay LAUSANNE (Reuters) – Prince, Leonard Cohen and Marcus Miller will headline the Montreux Jazz festival in July, expanded by the opening of a third concert hall "Lab", organizers said on Thursday. Cohen will open the 47th edition of one of Europe's most prestigious summer music events, on July 4, and give a second concert the next night. Prince was already booked for three back-to-back evenings (July 13-15) at the July 4-21 festival, the first since the death of founder and director Claude "Funky" Nobs in January after a skiing accident. "Three nights, three shows, he's …
