2004

- Sinfonia Celtica was born on January. At this time the line-up consisted of: Fionna (Vocals) Jesus (Guitar) Gutty (Guitar), Oscar (Bass), Ray (Drums). The band played a few local shows.
- Drummer Ray Gaytan is out of the band on March.
- Julio “Siamese” Castillo (Drums) and Tommy Boland (Keyboards) join the band on April.
- On July the band play their first Sold-Out show as Headliners in Saltillo Coah.
- On August Sinfonia Celtica returns once again to another successful show at Saltillo.
- On November the band played another great show as Headliner in Torreón.
- December: The band recorded a Demo (the final mix was not good, and the band decided not to release this material)

2005

- On January the band played for the first time at Café Iguana with Ira, Argos and Lordar.
- On April we returned to Café Iguana at the Metal Factory Concert as an opening act, with other local bands, for Transmetal.
- On May of this year Sinfonía Céltica is the final act at the Monterrey Metal Fest Pre Party at Café Iguana, sharing the stage and playing after Metal Legends as Ripper Owens, Neil Turbin and other great bands as Ignitor and Cristal y Acero.
- After this Show, Julio, Tommy and the band take parts away.
- On July the band returns on stage with Carlitos “The Chuck” as a replacement on Drums and without keyboards.
- On August Sinfonía Céltica becames the first band in perform at the Sabado Negro Festival.
- After this show “The Chuck” Left The Band.
- Fionna left the band on August.
- At this point with only the 50% of the band, Jesus, Oscar and Gutty decided to continue the project and to find new musicians.
- At November Dan joins the Band.

2006

- January: The band continues looking for a drummer.
- March: After a while, the band finally found a replacement on Grecko.
- On April, Sinfonía Celtica returns on stage.
- On May Lex Pierantozzi joins the band on Keyboards.
- The band continues playing...
- On October, the band played as an opening act for the argentine band Renacer at Ibex, having a very special guest watching the Sinfonia Celtica´s performance… C.C. DeVille of Poison who congrats the band after the show.
- On November the band suspended all activity and decided to record their first material.
- Grecko is out of the band...
- At December Kike Espeleta joined the band as a session musician. - Looking for a drummer... Again...

2007

- On January starts recording of the first material of Sinfonia Celtica “The Eye Of The Storm” (Demo)
- On March the band suspended recording to appear with Kike as a special guests at a show.
- May: The recording was finished
- Starts mixing...
- June...Gutty is out of the band...
- Same month... great news ... Julio “Siamese” Castillo returned on Drums.
- July “ The Eye Of The Storm” (Demo) is released.
- The band goes on with this line-up Dan (Vocals), Jesus De Rais (Guitar), Oscar Veliz (Bass), Lex Pierantozzi (Keyboard), Julio “Siamese”Castillo” Drums.