Today, since I saw no articles, I'll teach the very basic to most advanced rhythm guitar.
Basic rhythm. While alot of rythem guitarist don't get as much fame as lead guitarists, the rhythm is what keeps the song together. Lets start with a small practice exercise.
Hells Bells Intro:
e|------------------------------|------------------------------|
B|------------------------------|------------------------------|
G|----9---7------5-----7--------|----9---7------5-----7--------|
D|------7---7------5-----7------|------7---7------5------5-5---|
A|--0-----------0-----0------0--|--0-----------0----0---3-2-0--|
E|------------------------------|------------------------------|
This is a small exercise to warm up.
Composing your own rhythms.
How to compose your own rhythms is solely based on your tuning. Standard tuning you use power chords or bar for upper strings and drop D or drop C are the opposite. Also rhythms don't have to use chords, they can use single string notes tied together to create a rhythm. An example of each:
Power Chord ex. Blind Standard Tuning:
e|-------------------------------|
B|-------------------------------|
G|-------------------------------|
D|-------------------------------|
A|-----4---5----4----5--6-6-6-6--|
E|--0-2-0-3-0-2-0-3--4-4-4-4-----|
Bar Chord ex. Smoke On The Water Intro:
e|---------------------------------|
B|---------------------------------|
G|---------------------------------|
D|--5-8-10--5-8-11-10--5-8-10-8-5--|
A|--5-8-10--5-8-11-10--5-8-10-8-5--|
E|---------------------------------|
Single-note Rhythm ex. Hallowed Be Thy Name Secondary Riff:
e|-------------------------------|
B|-------------------------------|
G|-------------------------------|
D|----------------------6--------|
A|----4-5-7-5-4-5-4---7-6-4-5-4--|
E|--7----------------------------|
Combination: Power Of I And I Intro, Right Now:
Power Of I And I Intro:
C|--------------------4-3-------------|
G|--4-3-0-1-2-1-0-2-1-0-4-3-0-1-0-2---|
C|--4-3-0-1-2-1-0------0-4-3-0-1-0-2--|
Right Now:
C|----------------9-----------8-----------7----------|
G|--1-1-1-1-3-1-0-9-1-1-1-1-0-8-1-1-1-1-0-7-1-1-1-1--|
C|--1-1-1-1-3-1-0-7-1-1-1-1-0-6-1-1-1-1-0-5-1-1-1-1--|
A good way to compose rhythms is to listen to other songs and practice them to get good, then try making your own. Here's one I made:
G|--1--1-1-1--1-1--1-1--3-2-1-2--|
C|--1--1-1-1--1-1--1-1--3-2-1-2--|
If you notice, it sounds similar to the KoRn song, Faget. I made that riff after listening to it.
Rhythming unser solos.
You just played your harmony and getting ready for the moment. You look at your fellow guitarist and nod then he shreads a lead solo while your doing a sick rhythm under it. Rhythming under solos is one of the hardest part of being a rhythm guitarist: it's usually super-fast and if you screw up, you screw up the solo. Let's do the rhythm part of the solo to "The Ghosts Of Past Failures" by Shadows Fall (rhythm guitarist - Matt Bachand):
Part 1
G|--7-7-7-7-7--7-7-7-7-7-10-10-10-10-10-10-10-0-5-5-5-5-5-5-5--|
C|--7-7-7-7-7--7-7-7-7-7-10-10-10-10-10-10-10-0-5-5-5-5-5-5-5--|
PM. . . . . . . . . . . . . . . . . . . . . . . . .
Part 2
G|--3-3-3-3-3--3-3-3-3-3-0-2-2-2-2-2-2-2-2-2-2-2-2-3-3--|
C|--3-3-3-3-3--3-3-3-3-3-0-2-2-2-2-2-2-2-2-2-2-2-2-3-3--|
PM. . . . . . . . . . . . . . . . . . . . . . . . .
While this may look easy, it is pretty fast and fast Palm Muting like this is pretty hard, especially since you up and down stroke. I'm out, but before I go, If you guys weren't challenged enough, here's a little sumthin' to try:
What Drives The Weak Mini Solo(Shadows Fall):
F|----------------------------------------------8-8/10--13-13p10-13--|
A|--(6)p5-------------10--12-12b-------------------------------------|
D|--------7p5--7-----10--12-12b--12p10-9--10-------------------------|
F|15-----12-13-12--------------20b-20b-(20)-----20-------------------|
A|------x-----------13-----------------------15/17-18---17--18-(18)\-|
D|---x------------------15---(15)------------------------------------|
F|--15/18--17--13--15b-(15)------------------------|
A|---------------------------------15-13-13-13/15--|
I know it's not a rhythm, but it's for guitarists who want a challenge. I'm out. Any question, e-mail me at MetalFreekz@aol.com
I can't even play it! 
Do you have a lesson on how to play? 
.
