It's a command or an exclamation encouraging someone to sing. It's a very expressive phrase that can be used in various contexts, such as:
* Encouraging a singer: "Oh chante, tu as une belle voix!" (Oh, sing, you have a beautiful voice!)
* Expressing excitement: "Oh chante, la musique est tellement joyeuse!" (Oh, sing, the music is so joyful!)
* Starting a song: "Oh chante, c'est l'heure de chanter!" (Oh, sing, it's time to sing!)
It's a simple but powerful phrase that evokes a sense of joy and musicality.