Kos2 has seen 21 bands.

Band Concerts Seen
  The MET Orchestra 4 concerts
  Philadelphia Orchestra 2 concerts
  Renee Fleming 2 concerts
  Yannick Nézet-Séguin 2 concerts
  Anne Sofie von Otter 1 concert
  Bretton Brown 1 concert
  Bryn Terfel, Annabel Thwaite, Hannah Stone 1 concert
  Daniele Rustioni 1 concert
  Emerson String Quartet 1 concert
  Evgeny Kissin 1 concert
  Il Pomo d'Oro 1 concert
  Julia Bullock 1 concert
  Kristian Bezuidenhout 1 concert
  Lisette Oropesa 1 concert
  Pretty Yende 1 concert
  Quinn Kelsey 1 concert
  Ricardo Morales 1 concert
  Ryan Speedo Green 1 concert
  Simon Bode, Jonathan Ware 1 concert
  Simone Dinnerstein 1 concert
  Uma Thurman 1 concert