I'm not sure of your definition of Rock-n-Roll, but I'll assume a loose meaning:
Yes album remasters
Allman Bros. live at Fillmore East remaster
Lynyrd Skynyrd one more for the road -live remaster
Beck albums (most)
Jack Johnson (studio albums)
Ben Harper albums - excellent
White Stripes albums - more recent are better, but all are pretty good
Tool - some are HDCD
Primus
Days of the New - excellent acoustic guitar rock
Unplugged Alice in chains and Nirvana - both are stunning
Godsmack - The other side
Yes album remasters
Allman Bros. live at Fillmore East remaster
Lynyrd Skynyrd one more for the road -live remaster
Beck albums (most)
Jack Johnson (studio albums)
Ben Harper albums - excellent
White Stripes albums - more recent are better, but all are pretty good
Tool - some are HDCD
Primus
Days of the New - excellent acoustic guitar rock
Unplugged Alice in chains and Nirvana - both are stunning
Godsmack - The other side