Empress Valley has just released the long-awaited soundboard for Led Zeppelin's January 18th, 1975 concert in Bloomington, Minnesota. This is also the first time that a live version of The Wanton Song has ever been featured in a soundboard release. This video is a matrix of the soundboard, and the recently-surfaced audience tape from the same concert.
Unfortunately, the soundboard only covers about 60% of The Wanton Song, leaving the rest for the lesser-quality audience tape. However, I think it's enough of a powerful and bombastic performance to excuse that.