For me, I let the music, and the way the band is driving at a particular point dictate my fills. Some are planned with the music, others are vibe-driven. Sometimes I play fills that I cannot recreate for the life of me because I just felt it and went for it. The drummer on this clip is cool and I like his groove for the most part, but he is far from playing some gospel on this clip. That's some R&B stuff he's playing in the church. And if he was playing with a band, he would be overplaying at some points. But he is doing some nice fills in the clip. I would say study some music, and listen to the whole band, not just the drums. Vibe on the music, and apply the vibe to your playing. Don't even think about the fills, just do them. If you're vibing, they will come naturally.
