https://www.last.fm/music/Larry+Murray/+wiki
https://nl.wikipedia.org/wiki/Larry_Murray
https://bcbrown.net/bluegrass/chronicles/articles/ICMC2007/SSB_paper.pdf?fbclid=IwAR0NUM2LnG7UZqeL0kauD2uDqN3h0quNHkSZO8ziz4fsc09bwJ_DL1ry93Y
http://www.richieunterberger.com/hearts.html?fbclid=IwAR0bUhD-rd1KC2ese9Id0id7b9HSw72BqiM3j9SoRIN_nuwvtArsV7NwYH4