Theory Error: Polish Progressive Rock Presents Cover of Don Henley’s ‘Boys Of Summer’

The progressive rock/metal band promotes their debut album and announces the release of an audiobook Error Theory, a band that plays progressive rock/metal, debuted last year with a sensational album entitled "The Art of Death". Launched as a luxurious 3 CD box set, it delighted all those who had access to it. The band continues to promote it – releasing a song that is a cover, surprising for a progressive rock/metal band. It is Don Henley’s gre…