Hey there @Ignitra,
Thanks for posting.
Thanks for posting and welcome to the Community!
When a song is grayed out and won't play, it means that it's no longer available. Hopefully it'll reappear soon 🙂 You can find more info on why this happens here.
If you don't want to view unavailable songs, make sure to tap Your Library, then tap the gear icon to head to your Settings, then toggle off the option to Show Unplayable Songs.
Hope this helps 🙂