Competence, reliability, accompaniment skills, experience and last but not least the ability to convey calmness to band and soloists: these are the qualities that made me become a more and more requested sideman year after year.
A few links:
On keys with Michelle John (Eric Clapton’s backing vocalist and The Voice UK finalist)

On Keys with:Michael Stuckey (US Gospel Grammy Award Winner)

On Keys with:Jesus Christ Superstar – Rock Opera

On Keys with:Flavio Paludetti Hammond Trio

On Keys with: Giuliana Benedetti, Voice

On Keys with: The Powerful Gospel Chorale