K.K. is an Indian playback singer prominent in Hindi, Tamil, and Telugu films. Some of his hit Bollywood songs include "Tadap Tadap" and "Dus Bahaane." He has had recent successes with songs from films like "Mera Pehla Pehla Pyaar Hai" and "Bachna Ae Haseeno." The document also discusses the costs and details of organizing a "Live in Concert" event, including costs for the artist, venue rental, and publicity. It provides contact information for the event organizer, Outlook Events & Activation.