In addition to co-fronting the Posies and maintaining an impressive mix of solo work and other collaborations, Ken Stringfellow has been a member of two of the most important rock bands of all-time: R.E.M. and Big Star. But aside from an upcoming Posies single, these days Stringfellow is, like most of us, working at home, alone. On July 25, he’ll do his first-ever full-length, online solo concert, performing songs from his three-decade career. If you know what’s good for you, you will feel like plugging in.