I worked hard on my list and now include links to YouTube examples of the music of each band, using ideas from others and a lot of web searches. There is more than one version of this image -- other versions include a few more clues off the left edge of the image you posted from Wayback Machine (captured over 12 years ago).
- White Zombie (left edge in white with blood splashes)
- Seal (behind the zombie's shoulder
- Under the Streetlamp (right of the seal poster, or many other bands with similar names such as Streetlight Manifesto)
- Dead Kennedys (below streetlamp)
- Madonna (right of the dead presidents poster)
- Dresden Dolls (right of Madonna) - There is only one doll or mannequin, so I'm not sure if this is correct.
- The Postal Service (below Madonna)
- Cornershop (SHOP sign between Madonna and Whitesnake)
- Yellowman (below SHOP sign)
- Great White (mouth open at top of image, immediately right of Yellowman)
- Guns N' Roses (cart with flowers and guns in lower left of page)
- 311 (cart has 3 rose vases and 11 guns)
- Azealia Banks (yellow azalea flowers on cart)
- 50 Cent (shiny coin to the right of Guns N' Roses cart)
- The Roots (below 50 Cent)
- Dinosaur Jr. (below roots)
- The Angels or The Fairies or The Pixies (flying creatures around the Virgin Digital sign)
- Platinum Blonde (with bubblegum, above Virgin Digital sign)
- Led Zeppelin (right of Blonde Pig)
- Whitesnake (below Led Zeppelin)
- Kiss (below the snake)
- The Doors (colored panels shaped like doors to the right of Kiss)
- The Cult or The Choirboys (in white robes to the right of doors)
- The Killers (below right of The Cult)
- Queen (right of cart)
- Sex Pistols (in queen's hands)
- Eels (below Sex Pistols)
- Prince (to the right of Eels)
- Radiohead (above Prince - guy with radio for a head)
- The Cars (behind Radiohead)
- Iron Maiden (right of The Cult)
- The Police (right of Iron Maiden)
- The Rolling Stones (very large, behind the police and further to the right)
- Deep Purple (building behind left rolling stone)
- Gorillaz (one is behind the deep purple building)
- Cypress Hill (right of gorilla, above right of deep purple building)
- The B-52's (above cypress hill)
- Pink (sky color)
- Twisted Sister (right of radio head guy)
- The Go-Go's (right of twisted sisters)
- Black Flag (above Go-Go's on building)
- The Carpenters (three guys above and right of Black Flag)
- Crowded House (visible in window below carpenters)
- U2 (two u's below crowded house)
- BeeGees (BGG written vertically below U2)
- Talking Heads (in window below U2)
- The Eagles (in the foreground above the crowded house windows)
- Spoon (at the far right below the eagles)
- The Beach Boys (carrying beach boards to the left of Spoon)
- Bloc Party (above Beach Boys)
- MainStreet (MAIN street sign to the left of beach boys)
- The Black Crowes (perched on MAIN street sign)
- Cowboy Junkies (left of Main street sign pole)
- Jane's Addiction (with Cowboy Junkies)
- Garbage (knocked over to the left of cowboys)
- White Stripes (on street adjacent to garbage)
- Hole (above garbage)
- Ratt (below garbage)
- Scissor Sisters (below Ratt)
- The Smashing Pumpkins (right of scissor sisters)
- Eminem (spilled M&M's below scissor sisters)
- Nine Inch Nails (below left from the M&M's)
- Matchbox Twenty (below right from Nine Inch Nails)
- Phish (right of Matchbox Twenty)
- Jewel (right of Phish)
- Black Velvet song (jewels are inside the black velvet lined open box)
- The Cranberries (right of black velvet)
- Green Day (marked on calendar right of cranberry cases - note that this calendar shows 19 August 2006 as the first day of that week - in reality that was a Saturday. ISO 8601 sets Monday as the first day of each week, while in the US it's normally Sunday.)
- Red Hot Chili Peppers (above the green day calendar)
- The Lemonheads (right of chili peppers and also left of Korn, with smiley faces)
- Blind Melon (with sunglasses, adjacent to chili peppers)
- Korn (left of Blind Melon)
- The Butternut Squash Band (above Blind Melon)
- Alice in Chains (above squash)
- Blur (right of Alice)
- The Subways (underground behind Alice and Blur)
- And of course, Pavement is easily visible.
Bill