spt87_117 had been identified... the song is "the screaming trees - take them to the tree".
Greetings!
Spt88_121 will likely be impossible to find, since it's probably a user made compilation using samples from numerous videos and/or audio clips. I really would love to know what spk88_90 is as well as the beat and melody are sick.
Just a quick question, where did you get these from? Did you record them or were they uploaded somewhere?