Both of these are by the band Keane. The titles of the songs are "Somewhere Only We Know" and "Everybody's Changing". 

1st: 

 https://youtu.be/Oextk-If8HQ?si=4pS8mMwZAUMZp6-1

2nd:

https://youtu.be/RSNmgE6L8AU?si=OacM8jNk-eNqHeT-

In the song Everybody's Changing, a verse says, "You're gone from here, soon you will disappear floating into beautiful light.. "

Any song that mentions a person disappearing catches my attention. 

Steve M