Here's some trivia you then:
Tuning, of course, is the frequency where A4 is on the keyboard. From here, since tuning is logarithmic, it can calculate the frequencies of all the other keys on the keyboard. This is not the same as the sampling rate. 44100hz is 44100hz because it is exactly double the highest frequency humans can hear. According to Shannon's Theorem and formally the Nyquist Theorem, there exists a Nyquist frequency, that is, the highest frequency you can sample is exactly half the sampling rate. It is then no coincidence, that if most humans can only hear frequencies up to 22050hz, then sampling at 44100hz means you'll cover all the frequency range of normal human hearing. Likewise higher sampling frequencies (like 88200hz and 48000hz) are actually several of the following:
1) Used as advertisizing gimmics by companies like Dolby, Creative Labs and DTS to convince people their audio is of a better quality. (When really only about .1% of people can notice any real difference.)
2) Within the range of your pet's hearing
3) More or less only useful to retain precision when mixing master recordings.