If you’ve enjoyed your Spotify Wrapped look back at your last year’s listening habits, the streaming service has an even bigger retrospective for you. Spotify Party of the Year(s) looks back at all of your listening since you first started using the service, in my case dating back to 2009. It shows you the first song you ever streamed, along with your most listened-to artist, a playlist of your favourite songs, and more … Spotify is celebrating its 20th birthday, although it’s only 18 years since it officially launched and 15 years since its US debut. As Engadget reports, the company is celebrating its anniversary with a new feature, providing an all-time retrospective of your Spotify streaming history. The experience will display the first day someone used the platform, the total number of unique songs listened to, the first song streamed and most-streamed artists. Finally, there’s a playlist that includes a collection of a user’s top 120 songs.…