Quick and dirty today, I just wanted to touch on the idea of cueing the head out effectively from a solo/trading situation. A couple of quick thoughts:
1. Know and hear the song you are playing
The key to cueing the band effectively is to know where you are in the form at all times. This means you should try to always hear the melody and/or chord changes no matter what you are playing. Nothing is worse than giving a cue at the wrong spot in the form. Notice how I set up the simple vamp type sound and give the bass/pianist a clear look at the end of my last four in the video above (around 1:27), which leads me to my next point.
2. Give a clear que
3. Just play some time and try again
Play some time, establish a clear link with the band and try the que again. The more slick you are about covering up the mistake, the less impact this will have on your audience and the bands confidence, so try not to make a big deal out of it. Remember, in improvised music sometimes the most exciting moments come from mistakes.
For more on how to recover from getting lost, Todd Bishop also has a great post at his blog "Cruise Ship Drummer!".