Modest Mouse will have Les Savy Fav’s Seth Jabour fill in for guitarist Simon O’Connor during upcoming tour dates, Billboard reports

Modest Mouse has scheduled a lineup change for upcoming tour dates, with Les Savy Fav guitarist Seth Jabour set to fill in for Modest Mouse guitarist Simon O’Connor, Billboard reported on August 1, 2026.

The Billboard report said the switch is connected to allegations involving O’Connor, though it did not identify specific claims in the information provided for this desk. The report framed the development as a practical band decision for the tour, rather than as a resolved matter.

According to Billboard, Jabour will assume O’Connor’s role for the performances that are already on the calendar. The article positioned the change as a substitute arrangement designed to keep the tour on track with a full-time guitarist at each stop.

Jabour’s presence brings in a guitarist with experience from Les Savy Fav, which has an established touring and recording history. The report did not characterize the musical fit in evaluative terms, but it did identify Jabour as the replacement act within the Modest Mouse touring lineup.

For concertgoers, the most immediate effect is that live shows may sound different, particularly in parts that relied on O’Connor’s playing. Billboard’s account emphasized the personnel change tied to the allegations, making the lineup itself the primary development for attendees rather than any alteration to ticketing or venue plans.

Neither the Billboard report nor the information available here details what steps, if any, Modest Mouse has taken beyond the staffing decision, including whether the band has issued a broader statement addressing the underlying allegations or whether any further updates are expected as the matter proceeds.

With tour dates underway or approaching, the next concrete information fans are likely to seek is whether additional lineup changes follow, and whether the band or O’Connor responds publicly to the allegations that are being cited as part of the reason for the substitution.