That's a lot of different things coming together for the wrong reasons. You're using Fedora so you probably have XMMS and Rhythmbox installed which are both fine mp3 players. glibc stuff on the other hand you won't need unless you're compiling stuff from source. glibc contains all the libraries (useful stuff) used by c programs. The x86 is what archetecture the package is for: x86 is probably what you use (most people do). Other examples there are Solaris SPARC (server based arch from Sun, the makers of Java) and HP-UX (from Hewlett Packard, not just printers!). NetBSD is a different operating system all together. You know about Windows and Linux, well, BSD is a cousin to Linux. It's a Unix derivative just like Linux, but different. Interestingly, Apple Mac OS X is BSD based. NetBSD is a distribution of BSD, along with FreeBSD, OpenBSD, and a host of others. Hope this helps.