Shakti: they already have their theme: sanam re/banjaye ko ghar/ mujhe neend aata and I would probably add some sad songs, sun raha hai na, jee karda conveying their troubled love
Adharsh: ishqiyaan(that madhuri and nasrudhin shah film)or tu-bobby jasoos- because I think he might come to admire her but is shy about it
Garv: rasiya!(kurbaan)/pareshaan/ang laga le; of the fiery and passionate kind
Amar/Samar: matargashti/ishq bulaava, of the light hearted/teasing kind