I'd like to write a **Bass Clef** in a Math Text. I know math packages and `musixtex`. My goal is to write something like that:

```
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{stix}
\usepackage{mathtools}
\usepackage{musixtex}

\title{Chiave di Basso prova}
\author{PUCK}
\date{\today}

\begin{document}

\maketitle

\section{Introduction}

Let $\bassclef\coloneqq\bigl\{\bassclef,\le\bigr\}$ a Partial Ordered Set.
\end{document}

```

Why insted of `\bassclef` Overleaf outputs me an "$I$"?
I hope this question is clear. Thank you so much