I was gonna say I didn't know them, but I immediatly recognised the 2nd and 3rd song

Ya they are masterpieces and the 2nd one is pretty sad and ironic, as less than a month after recording that video and song Curtis took his own life at the desperately young age of 23 - so tragic. He married young, separated, delveoped epilepsy and had an all around awful time of it, only music freed him to express his mind and emotions. That will live on forever in his music.

I had no idea they were from the 70's era

Yep, def sounds more modern and is an influence on loads of bands in the 80s, 90s, 00s, 10s and 20s...