My mom has been a fan of Boyzone's song No Matter What since discovering it in Julia Roberts's film Notting Hill and my mother told me that No Matter What is a cover of an Andrew Lloyd Webber song of the same name and it was featured in one of Andrew Lloyd Webber's plays and I would like to know who the original singer of No Matter What was

You know you can look all this stuff up yourself, right?

https://en.wikipedia.org/wiki/No_Matter_What_(Boyzone_song)