Learn Italian: Voglio capire come comporre una bella melodia. - I want to understand how to compose a beautiful melody.

This is an implicit indirect question. Because the person wanting to understand (the subject of Voglio) is the same person who will compose the melody, we can use the question word come followed directly by the infinitive comporre. It matches the English structure 'how to compose' perfectly.

Could I use a conjugated verb instead of comporre?

Yes, you could make it an explicit indirect question by adding a modal verb, like come devo comporre (how I must compose) or come posso comporre (how I can compose). However, when the subject is the same in both parts of the sentence, using the infinitive is much more natural and concise.

Would the grammar change if I wanted to understand how someone else composes a melody?

Yes! You can only use the infinitive (the implicit form) if the subject is the same in both clauses. If the subjects are different, you must conjugate the verb. For example, if you want to understand how a famous musician composed, you would say Voglio capire come Mozart componeva una bella melodia.

Why is bella placed before melodia instead of after it?

While most descriptive adjectives in Italian go after the noun, adjectives expressing subjective or aesthetic qualities like bello often go before the noun to add emphasis. You could say una melodia bella, but una bella melodia sounds more natural and expressive here.