I don't know about you all but since my switch to MusicBee, I've used it on a number of machines, powerful & otherwise. Owing to this experience, and to the fact that whenever I described & successfully convinced my friends to switch to the 'Almighty' MusicBee I never missed out one particular word, I hoped (despite whichever combination will be approved & used),you'd include said word in the Slogan;
COMPACT
I think this word encompasses a great deal of MusicBee's description. Because as Powerful as it is, Jam-packed with great user-friendly features, it is unbelievably TINY. However, TINY doesn't really sound elegant, so.....COMPACT.