Early in 1989, Sako took the first step towards what would be a prominent future. He formed his first band, Shant, and began performing at various clubs, restaurants, and events in Los Angeles. In 1991, Sako met Vatche Mgrditchian, a well renowned Armenian and international singer. Vatche realized Sako's strong knack for music and offered to mentor the young artist. With Vatche's guidance and encouragement, Sako began working on his first solo album, Garodelem. The album was released in July of 1993.
Later that same year, Sako was introduced to Andy G., whose forte was arranging music. Seeing the lack of originality in the Armenian market, they decided to work together to create music and songs with a new style. Their hard work and creativity led to the making of Sako's second album, Siroumem, which was released in September of 1995, and contains one of Sako's greatest hit songs, Gaghatchem. With styles never yet seen before, Siroumem was a breakthrough in the Armenian market.
Emerging from the Siroumem album was the first ever professional Armenian music video, produced by Boris Nerses. The video was aired across Armenian channels. Being an affirmed perfectionist, Sako was still not satisfied and knew he was capable of much more. The inventive artist had ideas that he set forth to accomplish.
In 1998, Sako pioneered Armenian trance music with the release of his third solo album, Why. Now, Sako was completely original and was writing much of his own lyrics. Why is a smooth collection of modern love ballads and compulsive dance beats. The album won Best Dance Album at The First Annual Armenian Music Awards (AMAs).
Boris Nerses produced 4 phenomenal music videos from the Why album, which were aired on Armenian television programs worldwide. Simultaneously, world music radio stations were playing songs featured on the album. Sako was now beginning to obtain the recognition he deserved.
It was after the release of his Why album that Sako renounced working with Andy G. due to irreconcilable differences. He began working with his long time friend and former keyboard player, Robert Keyllian. The two collaborated on Sako's fourth album, Solitude, which was released in 1999. The remarkable music from the album was produced by Sako and arrangements were completed by Robert Keyllian. Solitude is a collection of brilliant melancholy ballads, combined with a great dance sound. The album received 3 nominations at The Second Annual AMAs, including: Best Dance Album, Best Original Song and Peoples Choice.