Starting out working as a stonemason and a fitter, he began his musical career as a DJ by organizing parties in clubs.

As a record producer, D'Agostino's uses the pseudonym "Gigi Dag"; he transforms a piece, originally destined for the discos, into a success for the mainstream public.

After successes like the track "Sweetly", he joined the team of Bortolotti, the general manager of Media Records and suddenly reached the top of the hit parades.

His single "FLY", published in 1996 with BXR Noise Maker, the label created by Media Records for Mediterranea progressive house, reached the top of the sales in Italy.

His biggest project was the self-titled debut album Gigi D'Agostino, consisting of 19 tracks, which sold over 60,000 copies.

After his rise to success, D'Agostino's musical style changed, with his sound becoming more melodic, at midway between house and progressive, with more energetic and melodious sonorities and less obsessive rhythms, also known as Italo dance.

"Un Giorno Credi" reached the top of the parades in Italy and became one of the most played songs in the national and international music networks.

In December of that year, he released Il Grande Viaggio, a compilation of his favourite songs, including old electronic pieces and new rhythms and melodies.

On 15 July 2004, his compilation "Euro Dance" won Platinum certification with 120,000 copies sold in just a few weeks.

In December 2004, D'Agostino released his fourth studio album, L'Amour Toujours II.D'Agostino has played in some well-known clubs throughout Europe, including in Italy, Spain, France, the Netherlands, the Czech Republic, Germany, Switzerland, and England (in 1996, he played at the Ministry of Sound in London with Mauro Picotto).

After some months, he released the compilation La musica che pesta under the name "Lento Violento Man", which contains two CDs for a total of 38 unmixed tracks.