Probot was Dave Grohls heavy metal project. He had always had a love for metal music, so when he had some spare time in the early 2000s, he recorded some instrumentals to express this. Later, he contacted well-known metal musicians and asked them to be involved with his project. Although Grohl did the majority of the instrumental work himself, each individual song features a different metal singer. Sweet Dreams is sung by King Diamond. This eerie song is a must-hear because, even if youre not into heavy metal; its still brilliant. It starts off slow and quiet and builds up throughout, using creepy whispers and disturbing laughter that would better fit a horror movie.