Warner Bros. Discovery is exploring a sale of its music assets that could be worth upwards of $1 billion, according to a source familiar with the matter. The catalog is being shopped by famed entertainment attorney Allen Grubman. While the potential sale — which was first reported by The Financial Times — is still in the very early stages, some of Warner Bros. Discovery’s current music partners could be potential buyers. Universal Music Group (UMG) already administers the publishing assets, which are likely the largest part of the deal, and Warner Music Group (WMG) distributes WaterTower Music, Warner Bros. Discovery’s in-house record label. The assets being shopped, including music and production music from the company’s television and film projects, are not the kinds of music rights...