Unavailable songs, songs turned unavailable. What are reasons behind?

[hgb123]

Plan

Premium

Country

Vietnam

Device

(iPhone, laptop)

Operating System

(iOS 12, Windows 10)

My Question or Issue

I've had some of my songs suddenly turned unavailable recently, but I don't know the reason why. Moreover, when creating playlist of some favourite songs in my childhood, I found that lots unavailable (eg: Alone Again by Gilbert O'Sullivan). 

Could anyone tell me some reasons about theses? 😞

[Nico]

Hey @hgb123! Welcome to the Spotify Community. ^^

That doesn't look cool.

Sometimes content is not available because of licensing changes.

Hopefully, Spotify will have it available again soon! ^^

Peace