Amazon wants to sell a cheaper music subscription service that will only work on its Echo player

Industry sources say would like to launch both services in September, but has yet to finalize deals with major music labels and publishers. One sticking point, sources say, is whether Amazon will sell the cheaper service for $4 or $5 a month. […] The lower-priced service would represent a novel approach. Other services have tried, without success, to offer subscriptions in the $5 range. But those have usually been variants of web radio services, which don’t let users play any song they want, whenever they want. – Peter Kafka, Recode