Easy Jazz Conception Trumpet by Jim Snidero
The easy jazz conception series is highly recommended for players who want to learn about jazz improvisation. The CD is great for listening and practice.
The Easy Jazz Conception Series was designed specifically for beginning to intermediate students wanting to learn about jazz style and improvisation. The book/CD set includes 15 etudes based on blues and standards at mostly slow to medium tempos demonstrated by a top soloist.
Listen to the soloist on the demo tracks to hear the nuances and phrasing. There is a backing track with only the rhythm section for each song so you can play along.