I didn't realize this
"Of the 32 NHL teams, only six — Philadelphia, Carolina, Dallas, Arizona, Vegas and Edmonton — don’t have an organist playing during games. Vegas, the last team to join the league before Seattle, didn’t have an organist in its first year, but tried it in Year 2. With all the other entertainment that went into the game production, the organ sound didn’t fit the soundtrack of Las Vegas."
That's actually less than I would have guessed and that makes me happy. Even in a limited role, I think hockey should always have an organ in the stadium.