I like this theme as it has a wide interpretation.
I chose the stamps I used on this envelope to highlight three individuals who made contributions to music: Johnny Cash, Edith Piaf, and Miles Davis
The Johnny Cash stamp was issued in 2013 as part of the Music Icons series. This remains one of my favorite USPS stamps ever.
The Edith Piaf and Miles Davis stamps were part of a 2012 joint issue with La Poste (France).