The song This Is It is performed by The Blamed .
this is it
it's all over
how do i carry you through the hard times
i will never forget you
the winds of change hurt so bad
this feels like it's all my fault
it's so hard to let you go
don't look back
who cares
it's all over
don't think i turned my back on you
a choice to do what is right
nobody said this would be easy
you've got to follow your heart
forever my best friends