I'm trying to learn how to sing. I downloaded an app that tells you the frequency of your voice and so far I haven't been able to keep it at one number. For example, I got my voice to switch between 124 and 125 hz. But it wouldn't stay on either. It switched back an forth a few times per second. I've experimented with difference frequencies, and each time it's the same.
So my question is, is it seen as desirable to have the ability to maintain one frequency? Is this something that good singers can to do? Or is the goal simply to match the frequency approximately, with some small fluctuation okay.
And if you think it's problematic, what are some effective ways to work on the problem?