Reddit mentions of Worship Piano: Hal Leonard Keyboard Style Series

Yeah, this P&W style stuff ends up getting me a ton of work because so many trained pianists just don't ever get taught to comp parts. Meanwhile, those who can only comp from chords can't read well so the lack of versatility ends up being a major hindrance to many.

>What do I play in between the chords? What do I play when I get to that chord? Do I just play a block chord? An inversion of the chord? An arpeggio? Something else?

All of the above. Ultimately you just have to learn some basic comping patterns as a matter of survival and then slowly refine that by being able to play better patterns, more alterations on the chords. add9s, sus4s, and such are very popular in P&W music to keep some motion happening.

They also just happen to be a natural byproduct of clever guitar tricks that make it easier to play praise rhythm guitar while singing... essentially limiting the number of fingers by pretty playing in G (with a capo) most of the time and then turning C (the IV chord) into Cadd9 and D (the V chord) into Dsus4.

In most styles you want to stay out of the way off the bass player, and that could be the case with a very experienced bass player but in most P&W music, it's less faux pas for the person on keys to thicken up the bottom end and add some rhythmic drive. Most basic comping patterns will involve you creating a composite rhythm between your hands essentially mimicking the sort of rhythmic strumming a guitar gets.

As you get better, you just need to learn to listen and learn when to support and when to just fill in gaps. Overplaying is a common problem for keyboard players in bands. With a full group you can spend a lot more time focusing mostly on fills and just light sustained harmony work. If you're using a keyboard, pads and strings synths can be very useful in praise settings.

Now, if you're purely solo, you basically just have to learn to listen and develop a good feel for various praise styles and emulate the guitar, bass, and drums all on your own. It's not as daunting as it sound, particularly if you don't have to play the melody yourself and can rely on singers or your own singing.

You can get a good start using this book. It's going to be particularly useful for someone with a formal background who is less comfortable in pop styles.

Very quickly:

• Add the second note in the chord for a more pop kind of sound. So if you're playing an F chord, add the G next to the A. This is especially good for chords I and IV in the key.
  
• add some kind of rhythmic pattern. Exactly how much extra rhythm depends on how intense a moment it is in the song and who you're playing with. I'll try to update this comment to provide an example or two later.
  
  Edit: I'm not sure If I'll come back to this comment, so in case I don't, on rhythms, I recommend chapter 11 of this Hal Leonard book for some ideas.