Premise: Three people are standing on stage and two of the people watch the other person play the trumpet.

Hypothesis: The two people looking at the instrument player are there to see if the instrument is tuned correctly.
Relation: neutral

Hypothesis: There are three people on a stage.
Relation: entailment

Hypothesis: Three people are standing on stage and two of the people watch the other person play the clairnet.
Relation: contradiction