Likely to be, for tradition's sake, John Lennon's "Instant Karma!" even though it's actually a pretty poorly engineered track and you can hear the main vocal mike oversaturating repeatedly.
But then next it's likely to be Marius Flothuis's "
Pour le tombeau d’Orphée" for solo harp because I want to hear a lossless digital recording with considerable dynamic range sent losslessly via Airplay to the HomePod.
https://www.wqxr.org/story/266854-valerie-milot-harping-aquarelles/
It's been a while since I've had a decent sound setup, so I haven't felt too constrained by MP3s at 256Kbs. But now I've spent the weekend losslessly reripping my classical stuff (including the box set my avatar comes from), because a good speaker and a lossless connection (Airplay transmits at full CD quality) finally make it worth the extra storage. I'm using a 2010-era Mac Mini with an SSD swapped in for my music server, wired to my router. Streaming isn't an issue for reasons I've gone into before* and Siri isn't an issue because I'm not going to be asking her to choose my music.
So the HomePod gets me a good Airplay speaker and a HomeKit hub, and that's enough to get it. If I get into the habit of letting Siri control my lighting, well, okay, but that's not the point, really.
*insert here my usual screed about how track/album/artist is a round peg in the work/movement/composer/performer square hole, how classical metadata is an excruciating mess of Frankensteinian force-fits because of it, how much metadata work you have to do by hand to get a reasonably coherent experience with classical, how logging into Apple Music causes their crap metadata to unfixably vomit all over your own hand-artisinal-crafted metadata until the second you log out again (No, Apple, you don't alphabetize Ludwig van Beethoven under L), and how you can't log into just iTunes Match and not Apple Music so you can't use iTunes Match without the Apple Music Metadata Curse and that puts iTunes Match right off the table.
