Apple's plans for minute-long iTunes samples may have been thwarted by the sheer number of deals it needed, both official and unofficial sources divulged Tuesday afternoon. Although all the music labels themselves are still reported by CNET as onboard, Apple had yet to clear both Broadcast Music Inc.'s performance rights and the National Music Publishers Association's rights. The NMPA brought Apple's plans to a halt a day before last week's music event after lawyers told association CEO David Israelite that a formal deal was essential.