premise: A man sings and plays guitar while another man sits at a table with a bottle of water. hypothesis: A musician in a cafe is performing for the tip jar.
neutral: Just because a man sings and plays guitar does not mean he is a musician.  The table does not have to be in a cafe.  The man does not have to be performing because he sings and plays guitar.  There does not have to be a tip jar because someone sings and plays guitar.