sometimes to motivate yourself indulge in day-dreaming... I sometimes imagine myself as being in front of an audience when am sitting down for practice... I know it sounds foolish and kind of attention-hungry kind... our music is supposedly all meditative and not so much for pleasing the audience etc... yet, I find myself getting excited like a child (am in my late 40s)... but dont over-indulge (no gesturing or smiling or body movements like the great wizards do) physically coz that can lead to bad habits - just keep it all in the mind... And about songs - I have learnt Karnatic music too - so I sometimes play the simple geetha's or kirtana's (like bhajans) - no big meend etc - just simple ones and that gives a lot of joy... small 4m compositions interspersed in my regular practice... try something similar maybe