Alexandru Petre began his artistic career at „Elena Teodorini“ Lyrical Theatre (currently The Romanian Opera from Craiova), as a chorister and later became an actor.

He became well known for his artistic performance in operettas, gaining the public appreciation, and formed together with the actress Carmen Roibu the traditional spieltenor-soubrette couple.

Alexandru Petre managed to blend in music, dance and high quality humour in an exciting manner.

Some of his relevant roles are: Nastasi („Let Me Sing“ by G. Dendrino), Mustafa(„A Ball at the Savoy“ by P. Abraham), Sigismund („The White Horse Inn“ by R. Benatzky), Jurubiţă („A Spring Dream“ by E. Roman), Hubert („Chaster Susanne“ by J. Gilbert), Baron Hubert („The Circus Princess“ by E. Kálmán),Baronul Zsupan („Countess Mariza“ by E. Kálmán), Miska, the Gypsy („The Gypsy Baron“ by J. Strauss,The Gardner/ The Manager of the Operreta Ensemble / Floridor („Mam’zelle Nitouche“ by F. Hervé),Vicomte Cascada / Niegus / Raoul de Saint-Brioche („The Merry Widow“ by F. Lehár), The Archduke  („Silvia“ by E. Kálmán), Egon („The Cousin from Nowhere“ by E. Künneke), Mousqueton („the Three Musketeers“ by P. J. Valentin),Hans, the garbage collector („My fair Lady“ by F. Loewe) and Bombonel („The Stone in the House“ by A. Flechtenmacher).

Alexandru Petre also interpreted several opera roles, such as The Notary in „Lucia di Lammermoor“ and in „Don Pasquale“, Ambrogio in „The Barber of Seville“ and Ulea, the Cupbearer in „The master builder Manole“, as well as The Mayor in the ballet „Coppelia“.

Musical comedies and children musicals proved to be extremely successful for the highly experienced artist. He was actually distributed in all the productions pertaining to this dramatic genre: „Who's Your Daddy?“, „A Nutty Family“, „Up on the Roof, in a Sack“, „Matache's Comet“, „Muşchetarii Măgăriei Sale“, „A Snow White Cinderella“, „The Princess and Her Tin Soldier“, „Cinderella“, „Stories-Stories“, „The Disobedient Rooster“, „Mary Poppins“, „Peter Pan“, „Little Dorothy“, „The Mischievous Singer“, „Long Road, Short Story“, „The Sleeping Beauty“.