Aaj Ki Raat Ye Kaisi Raat" is a timeless classic song from the 1964 Bollywood film "Mere Mehboob", starring Raj Kumar and Sadhana. The song is sung by the legendary duo of Muhammad Rafi and Saira Banu, with music composed by the iconic duo Shankar-Jaikishan and lyrics written by the renowned poet Shailendra.

The song is a beautiful and romantic duet that captures the essence of a magical night. The lyrics describe the enchanting atmosphere of the evening, with the moon shining bright, the stars twinkling like diamonds, and the breeze whispering sweet nothings in the ears of the lovers. The song's title, "Aaj Ki Raat Ye Kaisi Raat", translates to "What kind of night is this night?" and perfectly encapsulates the wonder and romance of the evening.

Muhammad Rafi's soulful voice brings a sense of longing and yearning to the song, while Saira Banu's sweet and melodious voice complements his tone beautifully. The duet is a masterclass in harmony, with the two singers blending their voices in perfect unison to create a sound that is both haunting and uplifting.

Shankar-Jaikishan's music is sublime, with a lilting melody that captures the carefree spirit of youth and love. The orchestration is lush and vibrant, with a focus on traditional Indian instruments that adds to the song's ethnic charm.

Under the direction of Mohan Kumar, "Mere Mehboob" was a critically acclaimed film that showcased the talents of its lead actors, Raj Kumar and Sadhana. "Aaj Ki Raat Ye Kaisi Raat" is one of the film's most memorable songs, and its beauty and charm continue to captivate audiences to this day.

Overall, "Aaj Ki Raat Ye Kaisi Raat" is a masterpiece of Indian cinema, with its enchanting lyrics, memorable melody, and exquisite vocals making it a must-listen for any fan of classic Bollywood music.