Seraphine - The Starry-eyed Songstress Champion Theme (instrumental) Link

You can listen to the full official track on the League of Legends YouTube channel.

If you're looking for a or a specific instrument like flute or violin solo, just let me know! You can listen to the full official track

A popular arrangement of the theme is available for Piano Solo on MuseScore. You can listen to the full official track

Combines modern pop production with subtle "clockwork" sounds to reflect her Piltovan origin. You can listen to the full official track

For a fuller sound, there is a Piano and Strings duo arrangement also hosted on MuseScore.