In my Top 10 All-Time Best Shows is Steve Earle and The Del McCoury Band at The House Of Blues in Hollywood in the 90's. Steve on vocals (of course) and acoustic guitar, Del and his boys on harmony vocals, guitar, mandolin, stand-up bass, fiddle, and banjo, all acoustic and unamplified. The six men were arranged in a semi-circle around a single large-diaphragm mic, whoever was performing the "lead" part a step closer to the mic than the others. While singing song verses that would be Steve, who when the verse concluded would step back in line with the others. When the fiddle player took a solo he would take a step towards the mic, stepping back in line when it was over. Fantastic music, fantastic sound!