Opened up my spotify app on my phone and went to a playlist that has over 100 songs. When I scrolled through, I noticed that there were may be only about 50 songs. I have other playlists too that have a lot of songs missing. Where did my music go?
Sometimes content is removed due to licensing changes. You can check if this is the reason music disappeared from your playlists by heading to your Spotify Settings > Display Options > Show unavailable songs in playlists. The unavailable songs will be grayed out.
Also, this could happen if the songs that are missing are your local files. You might need to sync your local files again to see if it helps.
All the best.
“Music acts like a magic key, to which the most tightly closed heart opens.” ― Maria Augusta von Trapp