; a wrong note in the right place sounds like a "choice," but a right note in the wrong place sounds like a mistake. Swing vs. Straight
For the trombonist, the slide is a curse and a blessing. The curse is that you must know where every note lives before you play it. The blessing is that you have the only instrument in the band that can scoop into a note, smear out of it, and laugh at equal temperament. jazz sight reading trombone
You can't get better at sight-reading by playing things you already know. Here is a practice routine: ; a wrong note in the right place