Sure, here are some of the biggest playlists on Spotify:

1. "Today's Top Hits" - This playlist features the most popular songs right now, with a mix of genres from pop to hip-hop.

2. "RapCaviar" - This playlist is a go-to for rap and hip-hop fans, featuring the latest and greatest tracks in the genre.

3. "Hot Country" - This playlist is a collection of the hottest country tracks, featuring both new and established artists.

4. "Viva Latino" - This playlist features the biggest Latin hits, from reggaeton to Latin pop.

5. "New Music Friday" - This playlist is updated every Friday with the latest releases, across all genres.

6. "Peaceful Piano" - This playlist is perfect for relaxation or study, featuring calm and soothing piano tracks.

7. "Rock This" - This playlist features the best in new rock music, from indie to hard rock.

8. "Mint" - This playlist is the ultimate destination for electronic music fans, featuring the freshest tracks in the genre.

9. "Are & Be" - This playlist features the best in contemporary R&B, from soulful ballads to upbeat tracks.

10. "Global Top 50" - This playlist features the 50 most-streamed songs on Spotify globally.

Remember, the size of a playlist can change frequently as Spotify adds and removes songs.