By Todd Bernhard
The saying goes "If it ain't broke, don't fix it." Well, Apple rarely goes by that saying, choosing instead to revamp and reinvent even its successful products. Still, Apple Music hasn't been the unmitigated success Apple might have hoped for. Now, in an effort to improve subscriptions, Apple is planning to refresh the year-old service this summer, according to reports. There have been some defections by key personnel, and artists have been lukewarm on the service, with some preferring the artist-friendly competitor, Tidal.