[Zeke]

If you want to make musical videos I suggest you upload your video first, then detach the sound and record the sound track separately while watching the video. That's the simple way using video editing software. When you do the sound part you can add a track of just playing the instrument or singing, or both. Short of buying sound recording equipment to edit your soundtrack, this is the simple way to go. If you don't get it right, do it again. But you have to be happy with the video and synch to it.

Or you can do it the other way around like Milli Vanilli did and lip synch to your audio recording. Actually you can sing and play while watching the video and just detach it and delete. It's just which you do first that becomes the master.

But the mic on the camera will never get the job done simultaneously with the video portion. You need to record the sound through the computer, not the camera.

There's all kinds of audio software for that so you don't need sound recording equipment. But you need a good mic. Maybe 2. And headphones are a must for editing or dubbing.