They qualify as "engaging background music" (as opposed to just background music which I don't like the concept of). Some Hip-Hop 3.5 off the top:

Alkaholiks-Likwidation
Beatnuts-Stone Crazy
Mobb Deep-Hell on earth
Redman-Doc's da name 2000
ATCQ-BR&L
Jeru Da Damaja-Wrath of the math
Pharcyde-Labcabin...

Some random ones in other genres:

Stevie Wonder-Hotter than July
Prince-Lovesexy, Around the world in a day
Parliament-Gloryhallastoopid
Metallica-...and justice for all
Slayer-Seasons in the abyss
Jesus Lizard-Shot
Pixies-Trompe Le Monde
Napalm Death-Harmony Corruption
Beatles-Sgt Pepper, Abbey Road...
Rolling Stones-Between the buttons
Sly&the family Stone-Dance to the music
Miles Davis-Bitches Brew, In a silent way
Dinosaur Jr-Hand it over
James brown-Hell
...and so on