From hmxhenry on rockband.com:

 Hey gang,

Just in time to celebrate his birthday on the 6th, next week's DLC is an 8 pack of Bob Marley tracks! This pack joins the full album download for Legend by Bob Marley and the Wailers. Enjoy!

Available on Xbox 360, Wii and PlayStation®3 system (Feb. 8):

“Bend Down Low”
“Burnin’ and Lootin’”
“Coming in from the Cold”
“Kaya”
“Lively Up Yourself”
“No More Trouble”
“Small Axe”
“Them Belly Full (But We Hungry)” X

(All tracks are original master recordings)
(These tracks will be available in Europe on PlayStation®3 system Feb. 9)

These tracks will be available for purchase as individual tracks and as “Bob Marley Pack 01” on Xbox 360,
PlayStation®3 system and Wii. Tracks marked with “X” will include Pro Guitar and Pro Bass expansions for $0.99 per song.

$1.99 USD, £.99 UK, €1.49 EU (160 Microsoft Points) per song
$2.00 USD (200 Wii Points™) per song
$0.99 USD (100 Wii Points/80 Microsoft Points), £0.59 UK, €0.79 EU per song for eligiblePro Guitar/Pro Bass upgrade
$13.49, £6.69 UK, €9.99 EU (1080 Microsoft Points, 1350 Wii Points) for Bob Marley Pack 01

Bend down low has a good Guitar part and Kaya is a good pick. 
The rest however I don't know much about. 
Edit: oh Burnin' And Lootin' has a prominent bass part.

Good tracks all round.
 
Although I'm stunned no ones knows "Lively Up Yourself" - One of his most well known tracks, on the first album released after the bands change of members and name.

Disappointed with this. When are we getting the 80's rock/pop? Want me some Cruel Summer :|

Ew.

Seems that they didn't want to pay for the songs people actually know. Granted, I am not a huge Bob Marley fan, but a little bit of "I Shot The Sheriff",  "Buffalo Soldier", "One Love" or "No Woman No Cry" would not have hurt.

I'm with @skrutop: and @Marcsman: on this one.

Bend Down Low is probably the only semi-known track in this pack.
 
at least, it's the only one I recognize...

" Seems that they didn't want to pay for the songs people actually know. Granted, I am not a huge Bob Marley fan, but a little bit of "I Shot The Sheriff",  "Buffalo Soldier", "One Love" or "No Woman No Cry" would not have hurt. "

Lively Up Yourself is a great song. The rest I don't recognize either.  :/