"This Is the Life" is one of Amy Macdonald's most famous songs, but based on your query, it looks like you're referring to the song "This Is the Life" or possibly asking about "This Is the Life" or "This Is What You've Been Waiting For" by Amy Macdonald. To clarify:

• Amy Macdonald is known for songs like "This Is the Life," "Mr Rock & Roll," and "Run."
• There is no widely known Amy Macdonald song titled "This Is What You've Been Waiting For."

Could you please confirm if you want information about the song "This Is the Life" or if you are referring to another specific song by Amy Macdonald? Or would you like the lyrics or background on "This Is the Life"?