After finishing, there will be a small sticker with the artist and song name that can be re positioned wherever you want. Take a photo or record video and the song will play while you do so.You will now have a slider above the record button that allows you to select what portion of the song you would like to include in your Snap.Select one or search your song of choice.
Here’s how to do it: Adding Music To Your Snapchat Photos and Videos
Snapchat has recently added a similar feature and with a bit of creativity, you can add songs to your snaps and even link to Spotify to share the music you love with your friends.