It's been said that inspiration is everywhere, you just have to look and listen.
Shortly after baby Ryan arrived, MacMillan apparently began hearing rhythm and harmony in the noises the boy made.
Check out the video in the player above!
MacMillan says he spent a year recording his son vocalizing and making noise around the house. When he felt like he had enough footage, he combed through the library of clips separating "all the sounds without a tone" and then sorted the remaining 83 clips "by pitch."
"There were a lot of repeats, so I ended up with 21 notes overall," MacMillan says in another video on his channel.
The pitch-less noises provided the "drums" for MacMillan's video, while the rest was used for harmony.
As you can see in the initial video, Ryan's sneeze is used as a hi-hat, a sofa hit is the bass drum and a slap on a hard wood floor provides the snare drum.
After MacMillan figured out the arrangement of "Thunderstuck," he began stitching together the adorable clip he uploaded last week.
MacMillan's videos are well-timed, too, as many AC/DC fans are expecting the band to announce new music soon.
Photo: YouTube / Matt MacMillan