I would say the wiki is very clear in the information.
in the colon Capacity it shows the storage room for the music notes.
right of that is the boost the maker buildings get from the portal.
under portal production boost you can see the bonus on the music notes the portal can produce.
the only thing you are missing is the times and goods needed for 1 song on every stage and that is very simple
on stage 2, 3 and 4 you can make 1 song in 4 hours and they use exactly the same amount of goods in every stage but on stage 4 you also get a new song that requires less instruments to compose compared to the other songs and it is made in just 3 hours.
I hope this table is all the extra info you need.
| Violin | Flute | drum | song |
treant balade | 30 | 27 | | 1 |
Elven dance | | 36 | 18 | 1 |
Troll rock | 23 | | 24 | 1 |
total 3 songs | 53 | 63 | 42 | 3 |
| | | | |
special song stage 4 | 15 | 18 | 12 | 1 |
total 3 songs | 45 | 54 | 36 | 3 |
savings for 3 songs | 8 | 9 | 6 | |