Stems are submixes created from more than one individual track. For example, one might provide a stereo percussion stem instead of a half-dozen individual drum tracks.
I could give you some tracks that you'd wonder how the hell the song ever came out sounding as good as it did That's what I said when I paid to get them. Grant it crappy drum set etc. I plan to give them a shot some day but you're alway welcome too them. Got 6 songs. Some need a little edit work.
My though was it's probley better to rerecord. I have a couple up under the signeture. One is swimming, another Last breath (it came out the best)