These are from my personal collection of FLACs. Also, I am sure that I will have more - those 2 are just the worst 2 from the first 400 songs in my 19,000 collection.
Just let me know what you'd like me to do - I'm glad to help. Especially since it will help me go through all my songs. I can look for more mismatches, convert to MP3 and upload, save the Codegen and song/identify query and response. Whatever I can do.
I found the first one online at Grooveshark. Listening to both this and my version, they are the same song - though not quite the same exact sound when comparing my FLAC to Grooveshark's whatever format.
http://grooveshark.com/#!/search/song?q=Augustus+Pablo+Unity+Dub+Ft.+Rockers+All+Stars
And here's the Bowie song from Grooveshark- same comments about quality:
http://grooveshark.com/#!/s/Fascination/38NJ3M?src=5