The singer, who has previously battled substance abuse issues, was onstage with his new band The Wildabouts when he decided to cover his old group's 1994 hit, but he struggled to stay on track and hit the right notes, prompting some to speculate about his sobriety.

A spokesperson for Weiland admits the gig wasn't a shining moment for the rocker, but claims a "perfect storm" of events contributed to the bad performance - and drugs were not involved.

The rep reveals Weiland, who was tired and had enjoyed a couple of drinks before the set, struggled with a faulty earpiece, which made it hard for him to stay on point during the song, according to

The publicist has also assured fans the audio equipment won't be a problem at his next concert in Baton Rouge, Louisiana on Thursday (30Ap15), adding, "Good news - we've overnighted him a brand new pair of earbuds and they will be there for his show in Baton Rouge tonight."