Not... really? I was kinda looking for something more Winamp 2.
From my experience and what I've used and what I know is out there it just doesn't exist for old Macs. All I want out of my music player is a main player with controls, and an easily accessible linear playlist, and maybe an EQ.
Here, this is the reality that I currently live in:
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MACAST (top left) is a Classic Mac OS music player made by some of the same people that made Winamp. It's.... fine enough, as long as you're also fine with no higher than 128kbps MP3s because it will
chug at higher bitrates. Also you better hope your MP3s are actually to the MP3 spec, because if they're not you'll end up with weird issues like the track length being missing (shown here). Also also I hope you're fine with MP3s at all because I'm pretty sure it doesn't play anything else other than maybe uncompressed PCM WAV.
SoundJam MP (far right) is also a Classic Mac OS music player. Yes, this is the one that got bought by Apple to become iTunes. This is, interface-wise, the closest to a Winamp 2 experience I've seen yet. It's lacking in other areas. It has the same format support as MACAST, but will actually give you correct track times more often than MACAST does.... but sometimes it can't parse titles correctly (shown here, with the exact same file).
The format support is lacking though because a few years ago I moved my entire music library, save for the lossless content, over to AAC. Neither MACAST nor SoundJam MP will play an AAC file. They want nothing to do with it. Which means for an overwhelming majority of my library, I have to play them in Vox.
Vox (bottom left) is the only OS X native application out of these three, and the only one that will happily play an AAC file. It is the closest thing that I've found to a straightforward click and play experience. It is not very good at it regardless. The interface is a little bit
too minimal. Playlist management doesn't exist-- if you open a file Vox will queue the entire folder in folder order and that is your playlist. That is not good user experience and it means that if I want playlists I have to move the raw files around. Not great.
In short, the perfect music player for me would have the SoundJam interface but with the format and platform support of Vox.