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Many thanks for your answer.
With your help, it will be

\begin{music}
\largemusicsize
\setlines{1}{0}
\setclefsymbol{1}{\empty}%
\nobarnumbers
\nostartrule
\startextract
{\Huge{\ding{192}}}$\;\;\;\;\;\;$
\Notes
\qa{a}\ibu0a0\qb0{a}\tbu0\qb0a\qa{a}\ibbu0a0\qb0{aaa}\tbu0\qb0a
\qa{a ...

Hello.
I am a music teacher and I want (for young pupils, easy rhythms) to write notes without music lines. For example, two eighth notes beamed together, triplets, ... (with the same height)
With \startextract and \startpiece, it automatically begins music lines...
I totally begin with musixtex ...