My take on 'Solid'. The chap in AC/DC. Now that's 'Solid' but I also love Mark King when he's not slapping because he is also playing for the song.
Sting, uses the bass as a counterpoint, and his bass lines aren't simple but they're not flashy or busy. But walking on the moon wouldn't sound the same if the bass didn't go, dud, dud, duummmmmm
If a muso told me my playing was 'Solid' I'd say to them, 'I know, thanks, glad you've noticed'
Locally there is a bass player that just shreds all over everything he plays. It makes no sense what he's doing. He'll mix 8s with 16s, in the same phrase and plays loads of notes. He's in a classic rock band and some people think he's brilliant because he plays so many notes but nothing he does fits with the music. He's not Solid or busy. Just rubbish!!