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Well, an interval is two note played simutaneously.

Chuck Berry used a lot of parallel fourths in solos. Power chords are basically parallel 5ths. There are a MILLION ways to use intervals.

As for arpeggios – it is simply a voicing of the chord. Not the chord (per se) as you may be used to it on the guitar, but as it is voiced entirely.

Take (for instance) the song by the Police "every Breath you Take" – the chords in that song are played as arpeggios with sustained notes – Starting with A add 9 the voicing is A E B C#, then F#m add 9; F# C# G# A etc.

Chords are built from the scales, so, arpeggios are as well – it all relates.

arpeggios are chords played one note at a time for ex. a Aminor apreggio is a,c,e played up and down the fret board to make an Aminor arpeggio. intervals can be used in many ways. a way that sounds cool is if you play the fifth of the chord when the chord is struck then you can go anywhere with it. try the third with the chord. you can use any interval that fits with the chord. have fun.

First, arpeggios… All of the notes of an arpeggio are notes of the major or minor chord, played one at a time. However, due to the way guitars are arranged, you can’t play a very big (many note) arpeggio by just fingering a chord and playing the notes one at a time. For example, an open G major chord can be used to play a G major arpeggio, and you will get (low to high) G, B, D, G, B. If you want to play the next note in the sequence, you have to play a D, probably on the B string, and you’ll have to abandon the chord to play it. If you want to play an arpeggio of more than 5 notes, you’ll have to do more than just finger a chord and play selected notes. And if you know your scales you can pick the 1, 3 and 5 intervals and play those, and you have an arpeggio.

I don’t quite understand the interval question. Any time you play two notes that aren’t the same, you are dealing with an interval. If you understand intervals and scales you can use it to help you select what notes to play when improvising.

i cant add to the arpeggio question because everyone else explained it better than i can so i will try the interval question. i’m not sure if i understand what you mean by how do i use them and i’m sure i will get my butt kicked by someone who majors in music theory but here goes:

what intervals to play are decided upon what key, scale, or mode you are using. knowing your intervals helps alot in harmonizing and in chord construction. for harmonizing you need to choose a scale or mode to find out what notes you have to work with. since i’m lazy, i’m going to choose A aeolian (A,B,C,D,E,F,G) and start with harmonizing a simple three note sequence:
A,C,E

E—-8-12—
B-10——–
G————
D————
A————
E————
to harmonize in thirds, play the note 2 intervals above the note being played. in the case its:
C,E,G

E—-12-15-
B-13——–
G————
D————
A————
E————

to harmonize in fourths, play the note 3 intervals up
for fifths, play the note 4 intervals up
etc.

remember this is for diatonic harmony only, and music theory is alot of fun to learn. but like eddie van halen said, if it sounds good, it is good.