function to get songs about a specifc playlist
| 1 | getPlaylistSongs(user_id, playlist_id, offset = 0, token)
 | 
| user_id | User id | 
| playlist_id | Playlist id | 
| offset | The index of the first songs to return. Default: 0 (the first object). Maximum offset: 100.000. | 
| token | An OAuth token created with  | 
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