America's Best Music is the on-air branding of a soft oldies and adult standards 24-hour radio network, formerly known as AM Only. The service is syndicated by Westwood One, a subsidiary of Cumulus Media. It was one of the original Transtar Radio Networks formats. Despite its old name of AM Only, "America's Best Music" is no longer exclusive to AM stations and is carried on some FM stations. Its main competitor is Music of Your Life, syndicated by Planet Halo, Inc. Until 2010, Timeless from Citadel/ABC Radio had been another similar format.