Man works at microphone with a group of informally attired musicians under the lead of a conductor .
There is a very good chance that a group of people with backpacks on are hiking up hill on a trail through the woods .
It is impossible that a group of people with backpacks on are hiking up hill on a trail through the woods .
There is a very good chance that a group of people with backpacks on are hiking up hill on a trail through the woods .
A group of people with backpacks on are hiking up hill on a trail through the woods .