A few ideas for more real tracks I'd like to see

flamenco guitar - rhythm and solo along with simple percussion 'real drums' such as castanets and hand claps.

string sections - held chords and more rhythmic chords patterns.

tango accordian and piano to go with the bass.

funk rhythm guitar where there is a consistant rhythm pattern played, maybe offering a variety of different patterns to choose from.

and finally more percussion 'real drums' such as simple conga and bongo patterns with an even and swing 16ths feel.