Okay I don't want to sound stupid but what are the different levels of singing or whatever like alto and something else ad what do they mean?

You have basically 6 levels of voices, 3 for males, 3 for females :

- bass : the lowest, deepest voice for a man
- baryton : higher than bass, middle voice for a man
- tenor : the highest voice for a man

- alto : the lowest, deepest voice for a woman
- mezzo : higher than bass, middle voice for a woman
- soprano : the highest voice for a woman

With work, a person can expand their range beyond the usual boundaries of one given group. Not by much because the human voice range is about 2 octaves, but some people can expand it to 3 full octaves.

Usually, choirs have only 4 groups : alto and soprano for ladies - tenor and bass for men. But most of the time, as there are few men singing, they are grouped all together. I'm a pure alto but as it so happened, I was asked to sing tenor because there were not enough men in the choir... I enjoyed it too !

Soprano ranges more higher notes for females and alto ranges the lower notes for females. Tenor has more higher notes for boys, not quite falseto though. And base deals with the lower notes for boys.