Every complete take in sing-along gets points from 0 to 100. You collect stars per part of a song, three at most: one from 60 points, two from 75 if most notes sit, and three from 90 if almost all notes sit and you sing with the guide quiet or off at the original tempo. Once every part of a song has three stars, the song is "Mastered".
How the points come about
The score is the average of two partial scores, which you see separately in the result under Details:
- Pitch: how much of each note's length you sang on the right note.
- Timing: how punctually you start the notes. A note counts if you start it on the right pitch at most 150 milliseconds before or after its start, or for long notes up to a quarter of their length; the more precise, the more points.
cori scales both values generously so that even a start feels like something: if you're on the note for 30% of its length, that's already 60 points for pitch, and at 70% it's 90.
Alongside the points, cori counts for every spot how many of its notes sit. A note sits if, for at least half its duration, you're less than a quarter tone away from the target note. That produces the verdict for each spot:
| Verdict | Share of notes that sit |
|---|---|
| Clean | at least 85% |
| Almost | at least 60% |
| Shaky | less than 60% |
Stars per part
| Stars | Points | also |
|---|---|---|
| ★ | from 60 | nothing |
| ★★ | from 75 | at least 60% of notes sit (as with "Almost") |
| ★★★ | from 90 | at least 85% of notes sit (as with "Clean"), guide "Quiet" or "Off", tempo 100% |
So the third star demands what a part needs in rehearsal: no loud model to follow, the right tempo, almost every note in place. In addition:
- Only complete takes count. If you finish early or the microphone barely heard you, there are no stars.
- The most help counts. If you switch to a loud guide or a slower tempo in the pause menu during a take, that applies to the whole take.
- The best take counts. A part keeps its best rating; a weaker take doesn't take a star away from you. The stars in the result only apply to the take you've just sung.
- The whole song counts for all parts. A take of the whole song scores each part it covers separately. So you can earn stars in several parts with one take.
- Short songs without parts get their up to three stars for the whole song.
- The loop doesn't earn stars. It does count as practice for your streak, though.
What you're missing for the next star
After every complete take, below the stars it says what the next one requires:
- "Next star from 75 points"
- "★★★: 90 points, quiet guide, original tempo"
- "For the next star, more of your notes need to be on pitch.", if the points are already enough but too few notes sit
If no spot is shaky any more and the take has at least two stars, cori suggests as the next step moving on to a part you haven't sung yet or leaving out an aid: first "Now at the original tempo", then "Now with the guide quiet". With three stars and a quiet guide, "Now without the guide" follows, just like in rehearsal.
The setup helps you too: if you choose a different guide for a part than suits its progress, a hint appears below the guide. With zero or one star it says "Sing along with the guide loud until the part sits.", with two stars "With the guide quiet you sing more on your own. That earns the third star." and with three stars "The part sits. Sing it without the guide, like in rehearsal."
Which part is "Recommended"
cori suggests the parts in the order in which a choir learns a piece:
- If you've never sung the song, the whole song first. One take already scores every part.
- Then each part once. A part stays recommended until it has a star or you've sung it three times, so you don't get stuck on a difficult part.
- Once all parts have been sung, always the weakest one, until each has three stars.
The ring on the microphone
As soon as you have the first star for a song, its microphone in the song list gets a golden ring. It fills with your stars: with four parts, twelve stars are possible, and with six of them the ring is half full. The ring counts the voice you sang last. For the first song with stars, cori explains this once with "New: progress on the mic". A mastered song also carries a small golden mark on the ring.
"Mastered"
Once you've sung every part of a song in one voice with three stars, the song is mastered. For the first song you manage this with, you get the Mastered badge ("Sing every part of a song with three stars."), and cori celebrates it right above the result. The badge comes once; every further mastered song carries the mark on its ring and "Mastered" in its progress. Unlike the stars, the badge belongs to your account and appears in your badge collection in the browser and in the app.
Your progress per song
In the setup, next to Part, it shows how many stars you have, for example "7 of 12". That opens "Your progress" (only for songs with parts):
- At the top, the ring with your stars and your status: "No stars yet", "Good start", "Halfway there" or "Mastered".
- Parts: for each part its stars, the best score with the guide you sang it with ("Part 2 · best 82 · guide quiet"), and what the next star requires, or "Got it". If you select a part, it's chosen for singing.
- Whole song: best score and number of takes, plus a history with your best result per day, for the last five days on which you sang the whole song.
- At the bottom, a button for the recommended part, for example "Recommended: practise part 3".
Where points and stars are saved
cori calculates the stars from your saved takes: points, guide and tempo, never the recording. cori only has this history where you sang. The last 3,000 takes are kept.
If it doesn't work
- No stars despite good points: if it says "Not counted: stars are only for a complete take.", you finished early. With "We couldn't hear you", the take doesn't count at all. And if the result shows "For the next star, more of your notes need to be on pitch.", the points are enough but too few notes sat.
- No third star despite 90 points: at some point in the take the guide was loud or the tempo below 100%, or fewer than 85% of the notes sat.
- The stars are gone: you're singing in a different browser, on a different device, or you've signed out of the app. Stars don't move with you; your "Mastered" badge does.
- The ring shows less than expected: it counts the voice you sang last. Each voice has its own stars.
- No new badge for the second mastered song: "Mastered" only comes once.
What's next?
- The exercise itself: Singing along to a song
- All badges: Collecting badges
- XP for practice plans: XP, levels and ranks
- Staying on track daily: Practice streaks