Repeating Tunes

Recent Hindi films have re packaged old songs.
Some repeated tunes by the same music director in the past:
Madan Mohan - Hai Tere Saath Meri Wafa (Hindustan Ki Kasam) and Ruke Ruke Se Kadam ( Mausam).
Hridaynath Mangeshkar -
Jambul Piklya Zaada Khali (Jait Re Jait) and Ayee Holi ( Mashaal).
Jaidev -
Kabhi Khud Pe Kabhi Halaat Per Rona Aya (Hum Dono)
and
Ajeeb Saaneha Mujh Par Guzar Gaya Yaaron (Gaman)