Bathory, "Possessed"
Bathory's second album, The Return of the Darkness and Evil, was one of the touchstones in black metal's first wave. Most of the traits of the genre were in place at this point, with the murky production, shrieked vocals, satanic themes, and punishing pace. The template would get refined on Bathory's next record, but this is one of the establishing albums.
The Unsemble, "Krishna"
The Unsemble are an experimental outfit consisting of Alexander Hacke (Einstürzende Neubauten), Duane Denison (The Jesus Lizard, Firewater), and Brian Kotzur (Silver Jews). There's nothing really rock about it, and it doesn't sound much like any of these folks' other bands, other than some of Neubauten's quieter moments. It's an interesting listen, though, and I recommend it.
No Age, "Drippy"
If you're wondering if we here at Five Songs listen to every rock duo that comes down the pike, the answer is yes. Yes we do.
Flying Saucer Attack, "Come And Close My Eyes"
...
I have nothing to say about this song.
Tortoise, "Seneca"
The cerebral, clean post-rock of the first few Tortoise albums really began to mutate some on Standards. There's still plenty of that glossy feeling to a bunch of the music on the album, but there's more grit involved with many of the tracks. And it was this first song that really told you that there was something different going on. Starting with overdriven drums, and moving into a section that feels both dubby and ever so slightly funky, Tortoise had really moved into something new. New-ish. It's an album that grew on me the more I listened to it.