Christidis Alexandros was born in Novi Sad, Yugoslavia from Greek parents. Later he moved with his family to former Czechoslovakia and in the city of Prague where as a child he became fascinated by music. Then his family moved to Tashkent in the former Soviet Union. At the age of 12 he enrolled in the music school to learn the accordion. Listening jazz records and watching big bands playing live, he became fascinated with rhythm and the drums.
He studied classical percussion in the preparatory School of the Musical Academy of Kiev. He collaborated with the Youth Philharmonic Orchestra of Kiev and with the Opera and Ballet Chamber Orchestra of Kiev. At the same time, he was also very active in the jazz scene, playing in various bands.

In 1973 he played in the first jazz record for jazz combo ever recorded in Ukraine (Kolesnikov – Novikov – Molotkov - Christidis quartet). In 1978 he repatriated to Greece and he took his Diploma in percussion from the Conservatory of Athens.

As a member of contemporary music ensembles, he has participated in numerous recordings, concerts and festivals in Greece and abroad.

He was principal percussionist in the Greek National Opera and he has also played as principal percussionist and timpanist in the National Symphony Orchestra of the Greek Radio and Television and the Athens State Orchestra.

Among others he has collaborated with Manos Hadjidakis, Nana Mouskouri, Maria Farantouri and the Orchestra of Colours.
He is the founder of the band Cammer-Ton and Allegro String band and he frequently performs in Greece and abroad. Since 2015 he have been the project leader and presenter of the "Jazz for kids".