"Yeh Kahan Aa Gaye Hum" is a popular song from the 1973 Bollywood film Kati Patang. Sung by Kishore Kumar and Lata Mangeshkar, the song features a romantic duet that captures the emotions of love and longing. The music was composed by R.D. Burman, and the lyrics were penned by Gulzar. The film stars Rajesh Khanna and Asha Parekh, and the song plays a significant role in expressing the characters' feelings. Its melodious tune and heartfelt lyrics have made it a timeless classic in Indian cinema, resonating with audiences for decades.