During the 1956/57 season at the Ljubljana opera house, Attilio Planinšek sang one performance of Manrico in Il trovatore and one
performance of Cavaradossi in Tosca.
During the 1957/58 season at the Ljubljana opera house, when Attilio Planinšek was already engaged as the new dramatic tenor, he sang 9
performances of Manrico in Il trovatore, 16 performances of Andrea Chénier, 8 performances of Erik in Der fliegende Holländer, 3
performances of Cavaradossi in Tosca and 2 performances of Radames in Aida. That is a total of 38 performances during the 1957/58 season.
During the next season 1958/59 at the Ljubljana opera house, Attilio Planinšek sang 18 performances of Radames in Aida, 3 times Turiddu
in Cavalleria rusticana, 13 performances of Canio in Pagliacci and 5 performances of Manrico. Total: 39 performances.
Planinšek also sang during the 1959/60 season at the Ljubljana opera house, but as a guest: 2 times Turiddu in Cavalleria rusticana and
2 times Canio in Pagliacci, 5 performances of Manrico, 10 performances of Cavaradossi in Tosca and 3 times Andrea Chénier. Total: 22
I found also a Slovene translation of a review of La forza del destino with Planinšek in the Times of Malta, November 1959. It states
that Licia Vallon (Leonora) and Attilio Planinšek (Alvaro) showed beautiful voices capable of coping with any problem. The reviewer
reports that they received a big applause after their arias. On the other hand, he thought their acting was not smooth enough. However this
lack of acting smoothness was overcome by freshness of their voices. The reviewer also praised orchestra and choir under Maestro Cremagnani
and the excellent direction and staging by Cadro.
In the late 50s or early 60s, he was also Calaf in Turandot in Opera Hrvatsko narodno kazalište u Splitu (Croatian National Theatre in
Split). He was a favourite of the Split audience, and considered to have one of the most beautiful voices ever heard in Croatia.
Planinšek was also Ismaele in two performances of Nabucco (29th July and 1st August 1962, cf. Slobodna Dalmacija, 22.7.2004).
On September 21st, 1965, he was Radames at Narodno pozorište (National Theatre in Belgrade).
In 1979 he was awarded a Milka Trnina (also spelled Ternina) prize (Nagrada Milke Trnine) together with soprano Blaženka Milić.