- Edited
Firstly....this. Don't be put off by the length (37m), all the good stuff is in the first 7 or so minutes. Sadly, you'll have to goto to youtube to watch it, it doesn't play when embedded (grrrr!).
Three things that work for me - Captain Obvious stuff for many, but hey - sometime the obvious is worth repeating:
Record your idea's. Literally THE golden rule. When inspiration strikes, grab a recording device and get that idea recorded. Guitar/drum beat/vocal melody whatever it is - record it. There's a hint of magic in the original idea that WILL haunt you if you don't get it down asap - because once it's gone, it's long gone.
- Nope, you won't remember it tomorrow. You might remember the notes, but not the groove/feel - trust me.
- I used to use the voice recorder (mp3 player) and then the smartphone as a voice recorder - but now I'm taking video's of the fretboard while playing. It's made a difference, why I can't really say - maybe it's a bit more 'in the moment' when I can also see what I'm doing.
Sparking creativity - at times you might feel uninspired (stuck in a rut). My goto is -> learn something new. Re-learning something old in a fresh manner also works really well for me (E.g. Learn a bassline from a song you know on guitar). Jamming with mates can be a great help and don't forget a good sleep, healthy diet and exercise plus taking a break from music could also be missing pieces in your creativity puzzle.
Work your idea's - this is a iterative step. 5% inspiration, 95% perspiration. A truer cliche' there might not be. Once you got a recording, check it out - give it a good few listens. Keep on jamming and re-recording it.
Sometimes what I played originally I can't replicate easy (or it was technically beyond me). So I gotta learn how to do it. I'll break it down into little technique things. Sometimes I just need to jam the idea until it's coming out easily from my fingers.
I'm constantly coming back to the feel/rhythm of the riff. Either foot tapping or running drum loops and feeling where the riff 1's (kick) and 2's & 4's (snare) are falling on the drums - they don't have to, I just like to feel where the idea fits around a rhythm or experimenting with what rhythm it fits around.
Asking "what's next?' or 'where does this go? or "what am I trying to express?" - extremely effective thoughts to have to direct the process or when you're feeling lost/stuck. Asking the question helps kick off experimentation and/or narrowing down experiments to something that you reckon works.
For the Anthem Challenge it took me three weeks to polish a idea into one working, recordable verse riff - I made at least 8 cellphone recordings of this one riff as it went from rough idea, to idea with drums, to expanded idea, to more expanded idea, to something I was ready to record 'properly'. The chorus and 'middle 8' both took under a hour once the main riff was finally recorded. Sometimes things work like that!