Jane's Addiction concert turns into a disaster when band members fight on stage

7:26 a.m. PT — Etty Lau FarrellWife of Perry Ferrellshared her account of the events leading up to the stage brawl and the aftermath … and she also shadowed Eric Avery big time.

Essentially… she claims that tension and animosity between the members had been building for some time… and that it came to a head on stage on Friday night in a spectacular, if sad, way.

After the fight… Perry was “a crazy animal for the next half hour – he finally didn't calm down, he just broke down and cried and cried.” She also criticized Eric… claiming he “took advantage of the situation and threw some unfair punches at Perry.”

Jane's Addiction's Friday concert turned into a total disaster after the band's two most famous members got into a fight in front of their Massachusetts audience.

Lead singer Perry Farrell had a heated exchange with guitarist David Navarro on stage at the Leader Bank Pavilion in Boston on Friday night – and the whole thing was captured on video obtained by TMZ.

Check it out… Dave cranked up his electric guitar solo while Perry angrily yelled into the microphone at the crowd.

Perry then took his anger out on Dave, walking up to him and body-checking him. While the two were complaining, Perry got in Dave's face, forcing him to back away. Perry then threw a punch, but only hit Dave's guitar.

A man stepped between them as Perry was charging at Dave. Several members of the road crew jumped in and dragged Perry across the stage, away from Dave.

We're told the situation had been brewing all night… Perry's voice seemed fine, but he kept singing certain verses over and over, annoying his bandmates.

We've reached out to Jane's Addiction for comment… no response yet.