“Tosca”, an opera in three acts, was composed in 1900 by Giacomo Puccini (22 December 1858 – 29 November 1924), an Italian composer who is regarded as the greatest and most successful proponent of Italian opera after Verdi. “Tosca” tells a touching love tragedy that took place in Rome in 1800. Musically, Tosca is structured as a through-composed work, with arias, recitative, choruses and other elements musically woven into a seamless whole. Puccini used Wagnerian leitmotifs to identify characters, objects and ideas. The power of its score and the inventiveness of its orchestration have been widely acknowledged. "Tosca" remains one of the most frequently performed operas. The arias in “Tosca” are very famous, such as "Vissi d'arte"(“I lived for art, I lived for love”) by Tosca from Act 2, “E lucevan le stelle”(“And the stars were shining”) by Cavaradossi from Act 3.

“Rigoletto”, “Aida” and “Otello”, operas in four acts, were composed in 1851, 1871 and 1887 respectively by Giuseppe Verdi (10 October 1813 – 27 January 1901), an Italian composer best known for his operas. "Rigoletto" was the first of a sequence of Verdi's three great operas during his mid-term, followed by “Il trovatore” and “La traviata”, which were to cement his fame as a master of opera. “Aida” is a tragic opera, telling a love story from the time of the Pharaohs of ancient Egypt about 3,000 years ago. “Otello” was Verdi's penultimate opera, which is based on Shakespeare's tragedy “Othello”.

More Info: en.wikipedia.org