Chord progressions.

if your asking how to change chords like from in example a C to an F i just play the B and E string together to give me time to get to that chord. idk if thats what ur askin or not so ya

If you are writing a song, you have to choose whether to write it in a Major key or a minor key. If you're shooting for a sadder sound, then you might try writing in a minor key. Your chords would necessarily be different from what you're used to. For example, if you wrote a song in E minor, you would have available to you the following widely-used chords, in order of degree (i-VI): Em, F# Maj, G Maj, Am, Bm, and C Maj. Play the chord progression i, iv, v, i and you'll see it's quite different from the I, IV, V, I you mentioned in your question. (DISCLAIMER ALERT: I know there's something screwy with the fifth chord--it's possible that I was wrong in saying it would be Bm, it may be B7 or something major like that. My level of experience isn't high enough to explain it. Frankly, you just don't find that many songs written in minor keys, especially when compared to Major keys. I would assume it's easier to write in a minor key if you're on piano.) If on the other hand, you don't want a sad song, then you'll probably want to write in a Major key. G Major, for example, offers loads of chords, but here are the basics: G, Am, Bm, C, D, and Em. (That's I-vi). What's funny is this: because the relative minor of G Major is E minor, the two scales include the same notes and most of the same chords, but begin on different roots and therefore have a different mood and feeling to them. ###---###---If I have been off-base with your question, let me look at it a different way. If you're getting bored with I-IV-V chord progressions, it's time to add the 2 minor and 6 minor chords to your repertoire. In the key of G, you can play A minor as the 2 and E minor as the 6th. I can play LOADS of songs using the G-shape chords and my capo. I know the 1-2m-4-5-6m chords in G. I struggle with B minor (3m), so either fake it or stumble through; but honestly, I don't find that many songs trying to drop the 3m chord. So, learn you G-chords and how to use a capo, then add to your chord vocabulary as much as possible, then, live long and prosper. PEACE!