.............And of course there are the times where I just take the basic idea of the song and make up my own bass part.
Get the chord progression from a chord chart, fake chord, Lead sheet, whatever you can find and then built a groove, (bass line), from the chord's notes, aka chord tones.
No that is not the melody, but, I never get a lead break anyway because other instruments do that much better than the bass can ever do, so they take care of the melody and I fit into the rhythm section. To do that my bass line is made from chord tones, i.e. notes found in the bass clef. If I feel the need to go out, or add other scale notes, like a pentatonic scale for example, I do so - IF it sounds good, but, it is amazing what you can do with roots, fives, eights and the correct three and seven, i.e. Cmaj7 R-3-5-7 or Cm7 R-b3-5-b7.
Root on one and then decide what other chord tones are needed, and or will fit. That and be sure to hit the chord changes dead on. Sure there is more, but, this keeps me gigging, and .... people keep asking us back......
My point?
You do not have to do everything.
Can not find a chord chart on the song. Write out the lyrics. Put them in verse format. Now decide which chords to use and where to place them. Start the verse with the tonic I chord, no not all songs start with the I tonic chord, humor me here. Want to add some tension? The IV does a real good job of adding tension. Figure the V7 will come up fairly close to the end of the second line of the verse and then probably for sure just before the ending of the 4th line of the verse. After a V7 chord you have a very good chance the I tonic chord will be next. Other than that throw in some IV, vi and ii chords for tension and color, wherever they seem to fit and end the verse back with the I tonic chord. That'll be close. Once you have one verse figured out the others will more than likely use the same progression. Read that again - basic I IV V7 and back to I can be used as a bare bone progression for most any song. Now listen and adjust.
Progressions that have written a zillion songs.
I-V-I
I-IV-V7-I
I-vi-IV-V7-I
I-vi-ii-V7-I
ii-V7-I and the list goes on and on.
- The I can go anywhere it wants to. The I chord is at rest and begs for you to do something - add some tension. As mentioned earlier the IV does a good job of this - then after awhile it wants to resolve and return back to rest so your verse, phrase, whatever can have closer and a new verse, phrase, whatever can add another item to the song. The V7 helps bring the verse to climax and when you return to the I tonic chord you are back at rest. Just waiting on the next verse or phrase used in the song. The other chords help in the following ways:
- The ii likes to go to a V or viidim chord.
- The iii likes to move the progression somewhere, it normally drags the vi with it on this movement.
- The IV likes to go to the V or viidim chord. Yes the ii and IV like the same thing thus can sub for each other.
- The V or V7 chord likes to go to the tonic I chord. Once you make the V into a V7 chord the V7 wants to resolve to the tonic I chord right now. I think of the V7 as the climax chord - anything after the V7 except the I tonic is anti-climatic, IMO.
- The vi likes to move to ii or IV chord.
- The vii likes to move to the I tonic chord like the V7 chord, but, is in no hurry so if you want to resolve quickly use the V7 chord, however, if you want to take a more round about way back to the tonic I chord let the vii start you on this journey, perhaps like in a turn-a-round, i.e. vii-iii-vi-ii-V7-I.
Just listening with out a clue where the song may go, relying upon your ear to tell you, well there is a better way. If you have some idea where the song may go, well that's half the battle won right there. Major key; the structure chords will be the I IV V and the minor chords, ii iii vi will add color, i.e. are not needed for the structure, however, do add color or flavor. They are the flesh on your bare bone structure. That vii will lead you somewhere and I bet you very seldom run up on it. Dirt simple three chord songs will utilize the structure chords, i.e. I IV V7 I in it's progressions. When you add the ii, iii, vi and viidim you move into a more complex song.
Listen and predict where the song is going....... That will get you the chords used in the song. And if you guessed correctly the melody will have notes from the chord that is active over this specific part of the melody. Why? Well the melody line and the chord line will share like notes for harmonization to happen. You have to have harmonization for the two lines to sound good with each other - so they share like notes. It's not rocket science.
Yes, it all fits together like a jig saw puzzle, little of this and a little of that - when put together - you get a song.
As I said at the beginning I play the chord tones. If I know how to play verse number 1, it's almost a given that I will know how to play verse number 2 & 3 and if I'm lucky the chorus will also follow the same progression and then it's a piece of cake.