I'd just like to interject for a moment. What you're referring to as musl, is in fact, GNU/musl, or as I've recently taken to calling it, GNU plus musl. musl is not an operating system unto itself, but rather another free component
of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.
Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU
which is widely used today is often called musl, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project.
There really is a musl, and these people are using it, but it is just a part of the system they use. musl is the kernel: the program in the system
that allocates the machine's resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself;
it can only function in the context of a complete operating system. musl is normally used in combination with the GNU operating system: the whole system
is basically GNU with musl added, or GNU/musl. All the so-called musl distributions are really distributions of GNU/musl.