(Honourable mention 1 - Live Aid '85, although it wasn't purely a 'Queen' concert)
(Honourable mention 2 - Kharkov '08, where Queen + Paul Rodgers played to about 350,000 people)
Top 10 Queen performances, musically-speaking:
(a difficult category to judge, as recording quality varies from show to show)
Tokyo 5-1-75
Boston 1-30-76
New York 12-2-77
Copenhagen 4-13-78
Newcastle 12-4-79
London 12-8-80
Buenos Aires 3-8-81
Leeds 5-29-82
Tokyo 5-9-85
Stevenage 8-9-86
Top 10 unofficial Queen concert recordings from the 70s, quality-wise:
London 3-31-74 - reel-to-reel tape
London 12-24-75 - "There Ain't No Sanity Clause"
Boston 1-30-76 - 24bit/96khz transfer from master cassette
Himeji 3-24-76 - "Princess Road" (Tarantura)
Boston 2-9-77 - from master cassettes > reel
London 6-6-77 - best video source
Houston 12-11-77 - best video source
Montreal 12-1-78 - from low gen cassette
Chicago 12-7-78 - from master cassette
Tokyo 4-14-79 - "Bootleg Race" (Tarantura)
Top 10 unofficial Queen concert recordings from the 80s, quality-wise:
Oakland 7-14-80 - from third generation cassette
Rosemont 9-19-80 - from master cassette
Tokyo 2-16-81 - "The Miracle Game" (Tarantura)
Buenos Aires 2-28-81 - soundboard > reel > cassette (2)
Sao Paulo 3-20-81 - "Morumbi Stadium 1981" (Pablo)
Vienna 5-12-82 - from first generation cassette
Birmingham 9-2-84 - from master cassette
Sun City 10-19-84 - soundboard recording
Osaka 5-15-85 - "The Last Concert In Japan" (Masterport)
Mannheim 6-21-86 - "Done Under Pressure In Germany" (Gypsy Eye)
Honourable mentions of significant shows and recordings:
London 9-13-73 - early radio broadcast in great quality
Liverpool 11-17-73 - fantastic early document of the band, including the non-album track 'Hangman'
Portland 4-28-74 - great recording of the band on their quest to conquer America
Tokyo 4-19-75 - Queen's first reaction to their Japanese fans
London 9-18-76 - audience recording debunks many myths surrounding this important show
Seattle 3-13-77 - best document of the Queen / Thin Lizzy tour
Copenhagen 5-12-77 - essential A Day At The Races tour recording
London 10-6-77 - Queen perform an informal and unique show
New York 11-17-78 - classic show, with strippers riding bikes on stage during Fat Bottomed Girls
Rotterdam 1-30-79 - some of Brian's best live guitar work caught on tape
Frankfurt 2-2-79 - many parts of Live Killers revealed here
Paris 3-1-79 - epic final night of the Live Killers tour
Milwaukee 9-10-80 - essential listening from Queen's US peak
Buenos Aires 3-8-81 - audience tape is the best insight into the frenzy of a South American crowd
Puebla 10-17-81 - Queen vs. the flying shoes
Leiden 4-24-82 - one of the best audiences ever
Sapporo 10-29-82 - many interesting versions of songs played, and full version of Teo Torriatte
Brussels 8-24-84 - a truly brilliant vocal performance from Freddie
Stockholm 6-7-86 - energetic opening night of the final Queen tour