Greetings from Argentina! I'm in my 30's, self taught, have enough gear and job+wife+choir = no time, the usual huh? My knowledge of music theory and harmony are scarce, yet I find myself a lot of times freely improvising by singing solos or complex bass lines... but only singing them, when there's already a bass player laying the harmony. When I pick up the bass I can't make up anything as complex and mainly stick to roots and maybe fifths. (wich are enough sometimes, but I feel I can put a lot more in there!) So my guess is that I need some theory backing me up. At the same time, as I stated in the title: I'm a terrible student. I've been at it for 10 years now and it's always the same: 2 hours session once or twice a month, instead of maybe 20 minutes per day wich I guess would be much more enriching. Do you know any books of bass/music theory (of course, bass oriented would be best) that's oriented to short lessons? Thanks a lot for reading and helping out fellow players!