Although he specialised in the 19th-century Italian spinto repertoire, he also sang in many 20th-century works and created the role of The King in Erik Bergman's Det sjungande trädet in 1995.

[1][2] Lindroos made his stage debut with the Finnish National Opera in 1967 as Rodolfo in La bohème.

He was engaged by the Royal Danish Opera in 1971 and appeared regularly with that company as a leading soloist until 1985.

Amongst the other opera houses where he appeared were London's Royal Opera House (as the Duke of Mantua in Rigoletto and Bacchus in Ariadne auf Naxos), the Teatro Colón in Buenos Aires (as Don José in Carmen), and the Teatro Regio di Parma (as Don José).

By the summer of 2003, he and his wife, the singer Gabriela Gaàland, and their young family had moved to Skåne in Sweden where he was planning to spend his retirement years as a cantor at the churches of Hästveda and Farstorp.