For an over-the-top arrangement, Jacob Collier's "Flintstones" (https://www.youtube.com/watch?v=zua831utwMM) is IT and "First Aid Kit" doing "Emmylou" (https://www.youtube.com/watch?v=Hi5A9OCAyIk) moves me to tears with a harmony so tight, paper won't fit in between.  
Gee, I forgot what the thread is...music does that.