The Marriage of Figaro
This is arguably one of Mozart's greatest opera. It covers the story of Figaro's betrothal and marriage to Suzanna, and how Count Almaviva is thwarted from his amorous tendencies towards Suzanna. The main characters include the Countess (to whom Count Almaviva is married), Figaro, Suzanna and Cherubino.
Cosi fan Tutte
Cosi Fan Tutte is Mozart's opera about deceit. Two young men who are very much in love with their fiancees are persuaded by an older man to take part in a challenge in which each must see if he can persuade the other's fiancee to love him instead. The opera is based on a text by Beaumarchais, and the ending is just as uncomfortable as its opening story.
The Magic Flute
The story of Tamino and Papageno's quests and trials. More detailed coverage can be found here
Mozart's opera about the nobleman who does his best to seduce every woman he encounters. Don Giovanni does eventually come to a very uncomfortable end, dragged down to hell by the Commandatori.
Symphony No. 40 in G Minor
This is one of Mozart's most famous symphonies, its melodic, sobbing opening appearing frequently on popular classics collection disks.
Eine Kleine Nachtmusik
This work can be performed either by a string orchestra or by a string quartet. You can read more about it here.
A Major is Mozart's most lyrical key and this sublime work is one of his greatest works. Learn more about an exquisite recording of it here.
Piano Concerto in C K 467
This piano concerto is often known as the Elvira Madigan because the slow movement was used as the music for the film "Elvira Madigan". It's one of Mozart's more lyrical concerti, displaying the skill and virtuosity required to play one of these works to the full.
Requiem K 626
Mozart's Requiem was his last work and as such unfinished. There are several complete versions and it is a regular work in the Classical Music repertoire. His wife, Constanze Mozart, sang in its first performance.
Mozart's Clarinet Concerto K622
Here is another late work by Mozart, again a sublimely lyrical work in A major. The Clarinet concerto requires great skill by both the clarinettist and the orchestra in drawing out both the virtuosity and the lyricism of the work and the best performances are almost unmatched by anything else in the literature. Read more about one of Jack Brymer's recordings of it here.