Lidarr
Looks and smells like Sonarr but made for music
...The tool also supports quality upgrades: if a better version of a track becomes available (for example, a lossless format), Lidarr can automatically fetch and replace lower-quality files, saving you manual effort. Integrated with many popular download clients and indexers, users can customize how Lidarr interacts with their existing setup for optimized automation. Built with a user-friendly web interface, it works cross-platform on Windows, macOS, Linux, and NAS systems, and can also run as a Docker service for containerized environments.