Over the years, I have been very involved in bodybuilding, healthy lifestyle, etc.... Not professional, just for my own benefit. This guy would NEVER use a tanning bed, or body glo...
I use/have used pre-workout supplements over the years, before lifting weights and before running distance running. Most contain caffeine so they obviously can give you energy. But I believe that the original poster is referring to the "focus" that they can give you.
I have taken these before playing drums before, accidentally sort of. With limited time, I'd take a pre-workout drink as I leave work so I can go to the gym afterwards. Sometimes, after taking it I would decide that I needed to practice drums (or troublesome parts of songs) that particular day instead of working out. This has happened in the past 18 months....I have an 18 month old so my time is VERY limited. Drums OR gym in a day, and rarely both.
I have noticed MUCH more focus on learning songs, technique etc when I have taken it before practice... But I would not rely on these before a show or anything. They are meant to be a supplement for intense physical activity. Although some may argue that drums are intense physical activity, it's probably not what the supplements were intended for.