...Because it certainly can't be ID3 tags, that's for sure. I'm gonna copy-pasta something I posted on another forum, because I've ranted about this in too many places right about now:
So, for the tl;dr crowd: I wanted to get album art on my phone, didn't want to plunk down money and didn't think to download MixZing (in retrospect, the latter was a stupid move). Downloaded something to tinker with the ID3 tags. Everything but my phone says everything's in working order (even used the music player on my DSi... who said that part was worthless?). So, why does my Droid's music player (and now, even MixZing), not recognize the tags I have on my phone? Should I backup my apps and stuff with Astro and do a factory reset? Because I've tried everything I could think of. And if I, in fact, do a backup, that's not going to affect any paid apps I have on there, is it?
[edit:] I guess I should note all the songs I've had problems with are in m4a format...
So, for the tl;dr crowd: I wanted to get album art on my phone, didn't want to plunk down money and didn't think to download MixZing (in retrospect, the latter was a stupid move). Downloaded something to tinker with the ID3 tags. Everything but my phone says everything's in working order (even used the music player on my DSi... who said that part was worthless?). So, why does my Droid's music player (and now, even MixZing), not recognize the tags I have on my phone? Should I backup my apps and stuff with Astro and do a factory reset? Because I've tried everything I could think of. And if I, in fact, do a backup, that's not going to affect any paid apps I have on there, is it?
[edit:] I guess I should note all the songs I've had problems with are in m4a format...