A few notes on these resources and on developing language within different musical languages:

• LISTENING is the most valuable thing in developing within any musical language, especially within groove-based musics like Jazz. Work on transcribing the phrasing and rhythms of melodies as well as solos, taking care to match EVERYTHING including exact rhythms, articulation, vibrato, ornaments, dynamics, etc. Check out the Recommended Creative String Players List to expose yourself to various improvising string players I love, but definitely don't limit yourself to only listening to strings!

• I tend to focus on the harmony and rhythmic aspects of Jazz when working with most classically trained violinists, since the harmony itself is a language that you may not be too used to (unless you play a ton of Gershwin!) These resources below are geared towards helping develop harmonic understanding and jazz harmony.

• The Circle of Fourths Worksheet is the first thing I’d recommend you practice. You should memorize a method to move around within the circle of fourths like the pattern I suggest there. I'm sure you've seen jazz exercises where they give you a lick and tell you to now ' play this in all 12 keys'. Most of us coming from classical backgrounds have no idea how to actually do this, so it’s very valuable to have a system for moving within the circle of 4ths (also known as the circle of 5ths when going backwards). This worksheet also shows the different types of basic 7th chords (the building blocks of jazz harmony) and how they're formed. 

• Also available on this page are chord only charts of standard Blues progressions and Jazz Standards to get you familiar with the basic 7th chord ‘Shell Voicings’ (scale degrees 1, 3, and 7) that are playable on violin, either strummed guitar style or with a bow as triple or double stops. Use these chord charts to get used to intelligent voice leading from chord to chord, and to start thinking harmonically in chord shapes, like a guitarist would. You can also use these chord charts to create your own looping versions of various pieces. I have a Video on YouTube where you can see me loop this exact Fly Me to the Moon chord chart strummed in straight quarter notes, followed by me playing the melody and improvising. It's also important to listen and study up on what types of 'comping' (improvised accompaniment) rhythms work within them. We call this improvised accompaniment 'Comping' in jazz. I suggest starting with straight short quarter notes all the way through (so 4 per measure usually) and then practicing them using other common patterns like the ones suggested in my Common Comping Rhythms worksheet.