Simon LeHare is at home in his gray urban environment but is wanting to try something new. He decides to learn how to play the tuba. To his delight, this simple act produces a most surprising result. With each note a leaf appears until at last there is an entire tree! With the help of Tim and his other friends, they use music to create something more beautiful than they could have imagined! The gentle moral about a slower, simpler, device-free lifestyle focuses on the importance of nature in an urban environment and unfolds on an empty and gray first page. As the pages turn, little bits of green begin to appear as Simon and his friends play instruments and sing, until the pages start to blossom with vivid, lush greens teeming with life. But when Important Edward sees what the friends have done, he vows to remove it immediately. Can Simon and Tim stop this opinionated elephant from cutting down their green oasis, and show him that even a small action can have a positive impact on the world around you?