When recording a musician or band performing, if you can get someone else to video along with you all the better. One of you can point the camera at the band and record a song from beginning to end while the other camera can be used to get odd angles, reaction shots, cutaways and these can then be placed into the master shot (camera that doesn't move) to add visual variety.

For interviews the main technique used and you've all seen it on television news and that is the Insert Edit. Don't know if this topic has been convered on the forum before (I'm just too lazy to go and look). But most interviews begin with an establishing shot of say a politician who walks past the camera. Then we cut to a Mid shot or Medium Close Up of them being interviewed usually with dialogue running over from the previous shot. Whatever the interviewer is talking about is then seen onscreen but you can still hear them talking and if you just listen carefully you will hear the audio from the new inserted footage very faintly in the background. This is where multiple video and audio tracks come in handy in your video editing package. The video of the interviewer describing inner city rejuvination is replaced with actual footage showing the actual rejuvination. The original audio is kept but new pictures and in some cases new audio as described above are inserted.