History with the org and the research topic
Current beliefs about the customer, the user and the proposed solution
Org'al or other barriers to be mindful of
Business objectives for the project and specific questions the research should answer
Concerns or uncertainty about the methodology
Instead of asking something like "what is your process for updating playlists", you can ask "show me how you update your playlists". This leaves a lot more room for a participant to elicit reactions and give a realistic run through of their pain points.
Sometimes asking the participant to envisage their ideal tool can reveal more insights.
Sometimes using physical objects can help build a shared understanding of a problem or solution. (eg. sticky notes, drawings)
It's important to check your worldview at the door. If you have ownership of a concept you are presenting it can lead the interview astray. The candidate may start asking questions about your solution. Try to sidestep these and turn it back on them (eg. why is this important to you)
You can be creative in how you prove or disprove hypotheses. ie. show provocative concepts.
It can be helpful to assign homework.
Use open ended questions.
Embrace awkwardness, if you fill the silence too early you don't leave an opportunity for the interviewee to speak
Question typesmake sure to leverage your research, take the org along for the ride. It might even be worth evangelising it so it becomes more of a standard.