For the people who are interested in how it works.
First, you need a blank "Score Scroll". You can buy these from an NPC. .

Next, you need to use the "Compose" skill. If you dont have the skill you can learn it by buying and advance reading the book "A Guide to Composing". It should cost about 500 gold.

Next, you will be asked to select a blank "Score Scroll" to use.

Next, the Score Scroll will be opened up and you will then have to fill it out with MML code and a title.
Depending on your Compose skill rank, you will have a limit on the length of your MML code.

Finally, Equip an Instrument and then the Score Scroll in your right hand.
Use the "Playing Instrument" Skill and you will then start to play your song..

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Compose Ranks
| Rank |
Melody |
Chord 1 |
Chord 2 |
| ~ |
200 |
100 |
0 |
| F |
400 |
200 |
100 |
| E |
500 |
200 |
100 |
| D |
600 |
250 |
150 |
| C |
650 |
250 |
200 |
| B |
700 |
300 |
200 |
| A |
750 |
300 |
200 |
| 9 |
800 |
350 |
200 |
| 8 |
850 |
400 |
200 |
| 7 |
900 |
400 |
200 |
In order to rank up Composing you will need to buy and advance read different skill books sold by the NPCs "Aeria" and "Nele".
Mabinogi 마비노기-Reinforce (NA-Mari, KR-Lute(류트), KR-Test(테스트))
-Sai (NA-Mari)
-Mahou Guild Leader-