Is here any kind of list about that on Wikipedia? It's really disappointing since I refuse to purchase stereo songs for RB or GH tbh.
No list sadly as HMX doesn't openly advertise whether each track has master recordings and stems. But if you check the old Rivals GAF thread me and a few people confirmed stems every week for most of the RB4 DLC so far. And starting from this week I'll be doing it here as well. Speaking of which....
Here's this week's first playthrough scores, stem confirmations and impressions for this week's new DLC single and Rewind track:
"Johnny B. Goode" - Chuck Berry - [Guitar: Tier 4 | Drums: Tier 2 | Vocals: Tier 4 | Bass: Tier 3]
Expert Guitar: 205,165 100% Notes Hit (457/457) Full Combo | Gold Stars
Expert Bass: 95,272 100% Notes Hit (497/497) Full Combo | Gold Stars
"I Want You Back" - The Jackson 5 - [Guitar: Tier 3 | Drums: Tier 3 | Vocals: Tier 5 | Bass: Tier 3]
Expert Guitar: 125,800 100% Notes Hit (761/761) Full Combo | Gold Stars
Expert Bass: 117,476 100% Notes Hit (566/566) Full Combo | Gold Stars
Stem Confirmations: "I Want You Back" is a certified master track with properly seperated stems what with it being a Lego Rock Band setlist song. "Johnny B. Goode" rather predictably isn't though. The whole track barring the vocals lower in volume and quality when missing notes on any instrument. It's a shame, but expected considering the song is over 50 years old!
DLC Impressions: "Johnny B. Goode" is a blast on guitar. Lots of rapid chord strumming during the verses and a whole bunch of fast, varied solos dotted throughout with a lot of unorthodox single note and chord hammer-ons and a whole lot of quick switch-ups up and down the fretboard. Bass is pretty damn good as well! Lots of steady single note strumming and movement back and forth across the guitar neck with a healthy dose of strummed note snaking throughout to help speed up the overall pace of the chart. Overall, recommended! "I Want You back" is fantastic on guitar with a focus on a lot of alt-strummed single note and chord switches with a heck of a lot of steady hammer-on snaking towards the upper end of the neck. Bass is pretty chill as well with just as much movement as it's guitar counterpart too, but it's a ton more relaxing and groove focused. So yeah, overall, a great week for guitarists and bassists. Get both if you haven't got the Lego Rock Band export for the Jackson 5 song.