Tommy was a bigger hit than the Who could have possibly imagined. They were suddenly headlining major festivals and playing to sold-out opera houses in major cities. The played the entire album every night, along with earlier songs and covers like "Young Man Blues" and "Summertime Blues." They were on fire every single night, playing some of the greatest concerts in the history of rock.
In late 1969, they began taping shows for a possible live album, though Townshend was unhappy with the results and ordered the tapes burned. (How many shows, if any, were burned remains a matter of hot dispute.) Tapes were rolling again when they played Hull and Leeds, England in February 1970, but Entwistle's bass parts weren't captured during the opening songs at Hull, so they released the Leeds show. The original record of Live at Leeds just had six songs (three of which were covers) to showcase their pre-Tommy live repertoire but, over the years, they've slowly released the complete show. They even released Hull, simply swapping in John's bass from the Leeds recordings on the opening songs.