Apple may be raising doubts among music labels that are keeping Spotify from a US launch, insiders alleged on Thursday. Senior officials from Apple reportedly told record studios in Los Angeles that they had "serious doubts" Spotify's model, which is led by ad-supported free service and $10 monthly subscriptions, could be profitable. The unnamed CNET sources also noted that Apple thought the service could take away from per song sales at not just its own iTunes store but others as well.