Wow guys. Thanks for the tips. Totally adding these to the list.
@Carlos - I checked Sims Wiki, it doesn't seem to confirm your information.
@Metro - Hmm, that is worth a note for sure. Thanks!
@Schip - Yep, good mood, that's a bonus! Those classes are very helpful because I remember Carl noting that he noticed that usually the first level of any skill is the one that takes the most time to learn. I think the gym bug got fixed in one of those later patches - either 1.21 or 1.22. I didn't know about the stove bonus. Learn something new every day!
Why would you be playing guitar in a library anyhow?
Schipperke, the LN cooker does that too!
Carlos, if it did increase the Guitar skill faster, I'd make my Sims play guitar at the library, too.
Would you mind noting the name of the stove? Thanks.