Apply an Extrude modifier to the spline and extrude it, then collapse all to edit poly and round up your notes shape, probably a good and fast way is to chamfeer the edges and apply mesh smooth or turbo smooth modifier.

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The secret of creativity is knowing how to hide your sources.
-Albert Einstein

That is certainly the way to do it, you could also use a bevel modifier to achieve a rounded look. Or you could model them with spheres at the base of the notes and extrude the stems out of the spheres. then add a turbosmooth. and use the extrude/bevel mod method for the more complex clefs and rest shapes.

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it works thank you very much

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