During the New Year's Eve of 2015, she was in Singapore as one of the guest artists for the countdown of Celebrate SG50, which marked Singapore's 50 years of independence. 2015 also marked her twentieth year in the Malaysian entertainment industry since she won 1995 RTM Bintang HMI singing competition. To celebrate the anniversary, a special one night only acoustic concert was planned and organized on 7 April 2015 at Istana Budaya. Titled Dato' Siti Nurhaliza Unplugged 2015, tickets for the concert sold out days before the concert date and her vocal performances and overall concert received positive reviews from reviewers and critics alike. Present in the concert were people who have helped her throughout the years including her former mentor, Adnan Abu Hassan and former Prime Minister of Malaysia, Tun Dr. Mahathir Mohamad. Two months later, the concert was released in multiple formats including CD and DVD with three additional tracks accompanying the CD release of the "Unplugged" album. In conjunction with her twentieth year in the industry, a special tribute song was gifted to her by Era FM and Raku (a radio station subsidiary of Astro). Titled "Inspirasi" (Inspiration), it was composed by Faizal Tahir and sung by him and Hafiz Suip.