http://bobostertag.com/music-recordings-motormouth.htm

has the CC-BY mark and says:

  "Like all my work, this music is available for free under a Creative
  Commons Attribution 3.0 license. You are free to download, copy, send
  to your friends, and mix and mangle, or throw in the trash. If you do
  use these tracks in your own work, please note where they came from."

But then much music is under NC:

  http://bobostertag.com/music-recordings-bookofhours.htm
    ==> NONE

  http://bobostertag.com/music-recordings-motormouth.htm
    ==> CC-BY

  http://bobostertag.com/music-recordings-w00t.htm
    ==> CC-BY

  http://bobostertag.com/music-recordings-livingcinema.htm
    ==> NONE

  http://bobostertag.com/music-recordings-alltherage.htm
    ==> NONE

  http://bobostertag.com/music-recordings-twins.htm
    ==> NONE

  http://bobostertag.com/music-recordings-attentionspan.htm
    ==> NONE

  http://bobostertag.com/music-recordings-saynomore1and2.htm
  http://bobostertag.com/music-recordings-saynomore3and4.htm
  http://bobostertag.com/music-recordings-burnslikefire.htm
  http://bobostertag.com/music-recordings-soonerorlater.htm
  http://bobostertag.com/music-recordings-djofthemonth.htm
  http://bobostertag.com/music-recordings-amelodynobitterness.htm
  http://bobostertag.com/music-recordings-pantychrist.htm
  http://bobostertag.com/music-recordings-pantychrist.htm
  http://bobostertag.com/music-recordings-fearnolove.htm
  http://bobostertag.com/music-recordings-voiceofamerica.htm
  http://bobostertag.com/music-recordings-gettingahead.htm

    ==> All of the above are CC-BY-NC, but paragraph above the license
      implies it's a ShareAlike license, which it's not:

        "This music is available for free download under a Creative
         Commons license, which allows you to copy, redistribute,
         re-sample, and re-mix my work, as long as you make your
         resulting work as freely available as I have made mine, and
         if you use a big chunk you should mention it came from me. A
         brief essay about why I chose to do this can be found
         here. If you feel like sending some money for your downloads,
         you can use the PayPal link, but it is not required. Note
         that the downloadable files are MP3s and thus are not the
         full fidelity of the versions on the CDs."

Also need to take care of:

  http://freemusicarchive.org/music/Bob_Ostertag/Sooner_or_Later/

And a bunch of the early stuff is at allmusic.com, such as:

  http://www.allmusic.com/album/creative-orchestra-koln-1978-mw0000173520  

Those have no license information as far as I can tell.