(Reuters) – Amazon.com Inc announced a scan-and-match digital music service on Tuesday, stepping up competition with Apple Inc’s iTunes. The new service will find music files on users’ computers, create matching versions of those songs and store them in the cloud, Amazon said. As part of the new service, Amazon announced licensing agreements with hundreds of music publishers and distributors, including Sony Music Entertainment, EMI Music, Vivendi SA’s Universal Music Group, and Warner Music Group. The licenses let Amazon create new versions of customers’ digital music files. …