A Feature I Used To Like In Spotify: Playlist Preview of tracks

I was on my mobile device long ago and went to my very long playlist of songs. 
I pushed my finger to the screen maintained my finger in the first song in the playlist.
And a preview of the song was being played then without takin off my finger...i scrolled.
And the beautiful thing about it was that I was able to preview each track seamlessly.
Without gaps each track was fading as I was  scrolling previewing every track.

I would call it Playlist Preview, Plz make this feature in deezer so that we can tune in 
like a radio by scrolling these very long playlists till a preview that a song we like catches us 
and we add it to our fav tracks or react to it...if you decide to add that beautiful feature
that would sort our fav tracks to different moods...someway...