So when Guns N' Roses' announcer yelled "Sydney" just before they walked on stage in Melbourne, the band were met with a chorus of boos.
And to make matters worse, the veteran rockers weren't even on time.
Luckily, it seems they made up for it with a rousing concert - and a swiftly issued apology on social media.
"Melbourne!" the band - which had just completed two nights in Sydney - posted on Twitter.
"Accidentally after 30 years McBob made an error, we're truly sorry. Thank you for coming out tonight!"
Luckily, guitar technician McBob, who has been introducing the group on stages around the world during their Not In This Lifetime tour, was quickly forgiven by fans for his momentary slip up.
One follower replied to the post with: "One mistake every 30 years... Reasonable."
Sydney and Melbourne, Australia's two largest cities, have had a long-running rivalry dating back to gripes over trade during colonial times.
Today they feud over which is the better city, with grudges mainly played out on sports pitches.
Guns N’ Roses Melbourne 2017: Rock gods sorry for Sydney snafu at MCG
ROCKERS Guns N’ Roses have apologised for confusing Melbourne with Sydney following their sell-out MCG show last night.
The band was booed after they greeted the MCG crowd as “Sydney” after keeping the 70,000-crowd waiting for an hour.
They were quick to rectify the error after copping some backlash on social media, taking to Twitter saying “Thanks for all the love Melbourne” and “Accidently after 30 years McBob made an error, we’re truly sorry”.
Taking to the stage about 9pm, and joined by AC/DC guitarist Angus Young for a hard-rock collaboration - all was forgiven by die-hard fans itching for a chance to see front man Axl Rose, guitarist Slash and bass player Duff McKagan together again.
And the monster crowd - mostly dressed in black, many donning ‘80s inspired headbands in leopard print - weren’t disappointed.
Rose showed he could still hit the high notes and Slash, hadn’t lost his touch.
The band played favourites You Could Be Mine, Sweet Child O’Mine to the frenzied crowd and some of their more famous covers Live and Let Die and Knockin’ On Heaven’s Door.
Fans after the show described the atmosphere as “amazing”, describing it in stark comparison to their concert at Calder Park in 1993.
Police charged two fans - one with using offensive language and another for hindering police - while a further 40 were evicted by security.
Two men and two women were also given infringement notices for public drunkenness.
Fans queued up for the iconic band early on Tuesday, with some including fan Mel Dobbs arriving at the crack of dawn.
Ms Dobbs was beaten to the front of the queue at the MCG by just 15 minutes when she arrived with camping chairs at 6am.
Despite the early start, it was nothing compared to her ordeal at the Gunners’ infamous 1993 Calder Park concert.
“I slept at the gate,” she recalled.
“Then my cousin fainted at the front, people just stepped over and around him.
“The Ambos gave him water but it was taken off him (by concert security).”
The then-17-year-old missed out on being among the first 1000 patrons given special wristbands.
In the line with her sons Kody, 12, Beau, 15, and partner Kris Krug, Ms Dobbs said she wouldn’t be repeating her mistake.
“I told them (if they faint) they’re left,” she laughed.
“I learned my lesson.”
Steve Booth allowed his son Jacob, 17, to skip a day of Year 12 to be at the ‘G.
“You need to experience Guns N’ Roses once in your life,” he said.
“I’ve indoctrinated him with heavy rock his entire life.”
Kerryn Row was there with her family too — three generations of fans in daughter Cassandra and grandson Connor, 15, after arriving at 8am.
But Tony Mason had been there.
The diehard fan was even at their 1988 Melbourne concert before they gained legendary status.
“I was a little tacker, only 12-years-old,” he said.
“A friend got a tape from LA and we thought they were amazing.”
His dad bought his ticket to tonight’s concert as an apology for a punishment dished out when he was in Year 9, when he threw out all his Guns N’ Roses memorabilia, “every T-shirt, every poster”.
“I’ve totally forgiven him though,” he said.
Guns N' Roses booed after confusing Melbourne with Sydney at MCG concert
Glam rock legends Guns N' Roses got off to a rough start at last night's MCG concert after the Melbourne crowd was greeted as "Sydney".
Thousands of people arrived hours before the gig was due to start and the crowd roared when the band finally hit the stage.
But the cheers turned to boos after guitar technician McBob forgot where he was.
"Sydney, you wanted the best but they're stuck in traffic, so here's what you get," he yelled, before introducing the band.
The mistake could have been forgiven the last time the band performed in Melbourne in 2013, given the venue was the Sidney Myer Music Bowl.
The three founding members - Axl Rose, Slash and Duff McKagan - had not played together for Australian fans since the 1993 Use Your Illusion Tour.
Lead guitarist Slash also followed up with a more colourful response.
He tweeted: "Melbourne, thank you for an awesome f***ing evening! Apologies for the Spinal Tap intro! But, we had a great f***ing time tonight! Cheers!"
Among the thousands of fans at last night's show were a married couple who walked down the aisle to November Rain, and a Catholic school attendee who had prayed in communion for Slash and Axl Rose to reunite.
Guns N' Roses will wrap up their Australian tour with concerts in Adelaide and Perth.