To celebrate 55 years of Lego, the company created fifty-five posters depicting popular culture vis a vis the reliable, interlocking toy brick. The complete list includes movies, stories and other elements, but I wanted to single out the nineteen music related ones here. They cover the gamut from bands to albums to songs, mostly playing on the colors of the bricks, but sometimes the layout mimics an iconic image or tells a little "story". I think I've got answers for 17 of them -- the two I'm stumped on are at the bottom.
Your guesses / improvements are welcome in the comments.