Music Player Mezzo is an offline music player for Android devices. It offers a range of features like waveform seekbar, equalizer with presets and sound effects, instant search, and dark and light themes with accent color customization. The application has a folder view with list or hierarchy structure modes, supporting instant search, albums, artists, and genres views. It also has a playlist creation and management option, including favorites, most played, and last played playlists.

Music library settings like excluded folders and minimum songs duration, sorting by title, album, artist, duration, date added/modified, and tag editor with lyrics and cover art are also available. The app supports .lrc synchronized or embedded lyrics and scrobbling with auto-detect feature. It also has a sleep timer feature (by songs, time, or interval), and customizable widgets of 4x1 and 4x4 sizes.

Music Player Mezzo has plug and play support for headsets and Bluetooth, including double and triple-click support. Additionally, it offers a set as ringtone feature. However, the waveform seekbar may not work for some tracks and formats.

Overall, Music Player Mezzo is a comprehensive music player for Android users with an extensive range of features and customization options.