LEGO has released a three-and-a-half-hour playlist that can serve as relaxing background noise while you play with their build sets. What’s even more interesting is that all seven tracks—each 30 minutes long—were composed using LEGO bricks instead of traditional musical instruments. For instance, “Searching for the One (Brick)” features the noise one makes when digging through a pile of LEGO pieces, while the track “The Waterfall” mimics the rumbling sound of water with LEGO bricks being poured from a container.