Hi Anton,
thank you for this topic. It's a very common question asked by people who want to "sound jazzy".
Not a stupid question, really

I try to answer...
QUOTE (antonskv @ Jul 2 2009, 09:09 AM)

As per your advice i started on your "Jazz Notes" series as my first task on GMC. Since i want to learn to play Jazz and learn about it so i naturally dived straight in!
Great choice
QUOTE (antonskv @ Jul 2 2009, 09:09 AM)

I want to ask you, what makes Jazz a Jazz? If that makes any sense! Well for example way back when i was learning Blues, i learned clear definitions... Like for example I-IV-V progression, Pentatonic/Blues Scale, 12 bar format, use of triplets, etc.. usually define the style of Blues. It's not a solid rule, but that's the basic guide line. Does Jazz have same type of guide lines?
Well, this is not the place to write a Jazz Theory/History Book but there are some common concepts around almost all Jazz music.
- Improvisation: it's the key element, in my opinion. A Jazz musician shows his abilities during his solos. Those skills are built over hours of practice, listening, thinking and jams with other musicians.
- Swing: this word itself can be the beginning of another book! Anyway, take a jazz standard, listen what the drummer is playing on the ride and probably you'll get what I mean

There are some jazz songs which are played with a straight rhythm, of course.
QUOTE (antonskv @ Jul 2 2009, 09:09 AM)

I mean II-V-I progression and use of 7th chords seem to be something that i pick up from almost all Jazz related lessons, so it one of definitions, are there more?
- Harmony: yes, you're right. Simple triad chords are used less often in Jazz music than other genres. Basically you find 7th chords. Jazz musicians always think about chord extensions and substitutions. Take a pop tune. Probably you don't find a C7b9/#5 chord...
Complex chords are another key element on the Jazz sound.
QUOTE (antonskv @ Jul 2 2009, 09:09 AM)

In Jazz multiple key change is very common, so can you even do Improvisations over Jazz progressions without knowing the chords?
Mmm.. no... You should always analyze a tune before starting to improvise. You can learn jazz licks from other musicians, write down some solos but you need to understand WHY those phrases sound good. You should think about the relationship between what the soloist is playing and the background harmony. Take a note on that phrase. Is it the root note? Is it a passing note? Is it a tension?
You can find some concepts about this topic on my Diatonic Improvisation lesson, but you need to understand well all the basics.
QUOTE (antonskv @ Jul 2 2009, 09:09 AM)

I mean in Blues you can jam just by knowing the key, even u can follow the chords 'cause u know that in I-IV-V progression chords will be the same while you stay in the key. But in lesson "II-V-I Progression" key-wise seem to be all over the place on purpose, so each round of II-V-I constantly moves the key a whole step. So how can person improvise over it without learning chords to follow of that specific progression?
You're right again. As a matter of fact, to improvise over a Blues tune is easier than improvise over a Be Bop tune, as example. There are many way to practice the II-V-I progression. You can improvise moving up a 4th, a whole step down, etc... Anyway, you should always KNOW the current chords "under" your solo. Talking about standards, you should know also the structure. Is it an AABA, a AAB, etc?
QUOTE (antonskv @ Jul 2 2009, 09:09 AM)

Seems kinda troublesome for me at the moment to comprehend effectively.
Please forgive me that kind of stupidity, but its something new to me, and though I'm not a beginner in guitar playing, this Jazz "theory" so to say, confuses me sometimes.
Thanks
Anton
Yeah, it's pretty normal. Take your time, talk with other musicians, read some theory book, experiment with your guitar.
Andrew helped me a lot with texts on my Jazz Notes Series - look at the video #2. If you have time, spend some time reading these texts and I'm sure you'll find many answers to your questions.
We have also a good theory section and many good lesson from other instructors about Jazz.
Hope this make sense