Sheilagank performed in numerous band festivals organised by high schools for about 2 years until the middle of 1998, when they got their first recording contract with the Sony Music Entertainment Indonesia label.
"Sheilagank" sempat malang melintang di pensi-pensi dan festival band SMA se-Jateng DIY selama kurang lebih 2 tahun, hingga pertengahan tahun 1998 akhirnya mereka mendapatkan "kontrak rekaman" pertama mereka dengan pihak label Sony Music Entertaintment Indonesia.