Let me not start on Liz! (and her obnoxiously gay friend who stans for a complete nobody and sounded obese)
But ANYWAY!
-The songs slayed me. Except for one which sounded weird but all of them were only like 3 seconds long, so. If I had to explain them, I heard a lot of funk(ish) sounding guitars, a lot of up-tempos, and a lot more pop-sounding than I expected, except maybe one that sounded really urban.
They were all very signature sounding Pharrell productions. (Apparently she's got 11 songs with Pharrell, and 5 songs with other producers.
) It sounded like there was very little vocal processing, etc.
- The Mac Miller collab is supposed to be out in 3 weeks apparently? ... I might be wrong, they might have been talking about his song with Ariana Grande. Either way the Mac Miller collab exists.
- Miley is allowed to post a snippet but it might not be a Dr. Luke song because of legal conflicts or something? Which doesn't really make sense because Dr. Luke was the one offering to post a snippet in the first place if Miley got permission...
- There's a song about a vehicle? Or two?
- And also there was one piano ballad-sounding song that Miley was belting on, the only line that got played was "You broke my heart"
I also might have heard another slower song, but it was more acoustic guitar driven.
I think that's all... But yeah. I'll admit when a Legend M song is bad (like her worst song, Stay for example being dreadful) but the snippets were really really exciting.
She was mentioning Dr. Luke songs plural, too. So like. 
*waits for Ellen to ignore us*
I'm sure Miley was only pretending to write Finally Home when Noah and Emily came up to her on camera.