My favorite Blu-ray to demo my theater is the - unfortunately out-of-print - Legends of Jazz Showcase. This is a "highlights reel" from Ramsey Lewis' PBS Legends of Jazz HDTV series consisting of the dynamite jams by his visiting stars: great music (in a wide variety of types of jazz and blues), with great camera work and excellent audio.
Jeff Beck performing this week . . . live at ronnie scott’s - "This one goes to 11!" When the sound is this clean, it goes right through you and doesn't hurt.
Legends Live at Montreux 1997—“Legends” was a blues band pulled together by slap bass player Marcus Miller, with Eric Clapton, Joe Sample, Dave Sanborn, and Steve Gadd - 'nuff said.
Willie Nelson and Wynton Marsalis play the music of Ray Charles All the hooks, and bebop too.
Santana's Blues at Montreux which he produced and guested on sets by three blues legends: Clarence "Gatemouth" Brown, Buddy Guy, and Bobby Parker - the one hour version on Classical TV has me panting for that 4 hour + disk.
Diana Krall In Rio has the same band as her fantastic Paris concert DVD
Stevie Wonder Live at Last A Wonder Summer’s Night great performances and excellent sound.
If you really want a 96/24 Blu-ray concert (most are 48/24 at best), check out the most recent Crossroads Guitar Festival disk (the earlier ones are only on DVD).
I'm sure I've left out quite a few.