Once you realize that the former Oakland Athletics slugger hasn't reinvented himself as an indie musician, the name Mark McGuire at the top of a Skylab bill might not ring a bell. That's because his home group, Emeralds, is among the music world's most cruelly overlooked.

Once you realize that the former Oakland Athletics slugger hasn't reinvented himself as an indie musician, the name Mark McGuire at the top of a Skylab bill might not ring a bell. That's because his home group, Emeralds, is among the music world's most cruelly overlooked.

"Does It Look Like I'm Here?," the Cleveland band's most recent catalog entry, was my second favorite album of 2010 - a mesmerizing cascade of robotic synth riffs, pulsating crescendos and shimmering interstellar joy. A track's mood and texture sprang forth from repetition, but nothing ever tired or fell stale.

McGuire's solo performances, which are conjured through loop pedals and the like, work in a similar way and unfold with familiar punch. A riff becomes a recurrence, then a layer, a rhythm and a backbone for future ideas. It's ambient at its most ambitious.

Moth Cock, Comet Bodies and Nexus 2.11.11 also will play. Admission costs $5.