Romance without words

At a formal level, one usually starts with a tripartite ABA and then perhaps ABA'; in this scheme, practically the first 4 bars are the beginning of the A.

If you have 4 bars of A, you can then do 4 of response, 4 of recapitulation, and 4 of closing... likewise for B and then for A or A'

So each section is 4+4+4+4

Obviously, this is an example... at a harmonic level it depends on many things, not to mention whether it is a stylistic exercise or something more free.... so it depends.

I hope this helps you

for harmony you can for example use the scheme of an existing romance... see Mendelssohn.

It wouldn't hurt to consult texts such as:

Gorini Falco-Jorio, La romanza senza parole, Ricordi

Silvano Carella, Il componimento della terza prova del compimento inferiore di composizione, Bèrben

I do not quite agree with the systematic use of harmonic patterns, as suggested by Oracolo; I find it more useful to analyze and use the solutions learned.

Oracolo wrote:

for the harmony you can, for example, use the scheme of an existing romance... see Mendelssohn.

The important thing is that the harmonic progression of the romance you choose is not very far from that of the theme, otherwise it will be like apples and oranges... or you might have some "complications." Therefore, as Valkyrie says, analyze and then elaborate... using an existing scheme involves a process of selection that is not necessarily easy to do, or to do consciously, for someone who isn't properly seasoned.

I thank you very much for the suggestions....