What a cool voice you have~ I can't tell if you're more of a baritone or bass, but I can tell you've got an ear for the songs you're singing. c: And for a phone recording, the sound quality is very solid!
If I might offer some friendly feedback from a fellow musician, your timing was a bit off with the backtrack in Rains of Castamere. Practicing with a metronome could help establish a more firm beat, since that song in particular is less obvious about where its pulse is than the second track. And, focusing on your breathing and taking a more warm, full breath on an "Oohh" syllable before singing each phrase helps tremendously with stabilizing your pitch.
Keep singing, man! c: Do it every day, and keep making music~ Even if it is just a cover, it's a wonderful thing. Thank you for sharing it with us.
