I agree with everyone else. I play other instruments including keyboards. I do about 90% of my writing on piano. It ensures harmonic movement. You can almost always tell when someone writes on bass. The songs are usually 'riff' songs and/or static chord grooves. I can't listen to a whole CD of that. That's why I don't listen to 'bass' music.
Also, I prefer to be able see 'my theory' 3 ways. The overlapping and symmetrical layout of the bass, the linear layout of the keyboard and what I call the 'chalk board' layout(written).
But studying music with a spouse is a totally different subject,...
I slept on the sofa many nights trying to give my ex wife lessons.
It would usually go something like this,...
"No baby, that's not a secondary dominant. That's the tritone substitution of the secondary dominant. Take your time and focus."
"Well, you left dirty dishes in the sink this morning!!!"
"OK, I'll sleep on the sofa again. I like watching the Sportscenter loop over and over again all night long anyway."