"This Is the Life" is one of Amy Macdonald's well-known songs, but "This Is What You've Been Waiting For" is another track by her. Specifically, "This Is What You've Been Waiting For" is a song by Amy Macdonald from her 2012 album Life in a Beautiful Light. It’s a melodic, introspective track showcasing her signature folk-rock style. If you want, I can provide more details about the song, lyrics, or background. Would you like that?