Here is just a taste of my favorite soundtracks/songs:
Tridev--the entire soundtrack is awesome. And the lift from Gloria Estefan's 'Rhythm is Gonna Get You' ('Oye Oye') is actually better than the original.
Listen here: http://ww.smashits.com/music/hindi-film/songs/1879/tridev.html
Mr. India--Hawa Hawaai and Kaate Nahin Kat Te Yeh Din Yeh Raat are my favorites. If you haven't seen the picturization of the 'Kaate Nahin...' you are missing one of the 80s hottest scenes.
Listen here: http://ww.smashits.com/music/hindi-film/songs/1925/mr-india.html
Chandni--Awful movie (IMO) but good soundtrack! Especially 'Mere Haathon Mein Nau Nau Choodiyan' and 'Parbat Se Kali'. Listen here: http://ww.smashits.com/music/hindi-film/songs/1323/chandni.html
Nagina--what can I say? 'Mein Tera Dushman' is one of my favorite songs of all time. I also love 'Aaj Kal Yaad Kuch.'
Listen here: http://ww.smashits.com/music/hindi-film/songs/4106/nagina.html
Naam--Naam has one of the most famous and beloved songs of Bollywood: 'Chitti Aaye Hai.' While the remainder of the songs are not as top notch, I personally like 'Veriya Ve' for it's biting tone and also 'Ameeron Ke Shaam' and 'Tu Kal Chala Jayega' because I LOVE Mohammed Aziz.
Listen here: http://ww.smashits.com/music/hindi-film/songs/677/naam.html
And speaking of Mohammed Aziz, he is probably one of my favorite male playback singers of the 80s and early 90s. He has some AMAZING 80s songs. I would recommend checking them out on cooltoad here: http://music.cooltoad.com/music/search.php?user=good_fella
Some of the best are 'Atay, Atay Atay,' 'Mere Samne Tu' and 'Kuch Kuch Hota Hai.'
'Neele Neele Ambar' from Kalakar. Great use of synthasizer, a peppy 80s track that still sounds great today.
'Aa Dekhe Zara' from Rocky. Ah, 80's disco. Gotta love it.
'Jano Janaam Jaan-e-maan' from Sultanat
'Tere Beemar Mera Dil' from Chaalbaaz (craziest picturization of all time)
'Pyar Do Pyar Lo' from Jaanbaaz (Again, I LOVE that 80s Hindi disco! You may also enjoy the English version of the same song)
'Saajan Mera Us Paar' from Ganga Jamuna Saraswati
'Thoda Resham Lagta Hai' from Jyoti (made better known today by the rap group Truth Hurts that sampled it a couple years ago).
I could go on and on, but I'll stop for now.