Explanation of 3/4 time signature
In the article time signature, this is explained that:
- the top number indicates the number of time units in a measure (bar
- the bottom number determines the unit of time.
We can visually translate
That is to say that there are 3 quarter notes
1 quarter note
2 eighth notes
4 sixteenth notes
and so on...
Examples found in famous works
J.S. Bach, Jesus bleibet meine Freude, BWV 147
The chorale of the cantata BWV 147 by J.S.BACH titled "Jesu, bleibet meine Freude" ("Jesu, Joy of Man's Desiring") uses the 3/4 time signature:
This work is composed in G Major and its particularity is that it uses the superposition of ternary rhythms (triplets) and binary rhythms (dotted eighth note / sixteenth note).
Mozart, Symphony n°41, movement III, trio
The Minuet Trio from Symphony N° 41 in C major KV. 551 by Wolfgang Amadeus Mozart also uses the time 3/4 time signature:

You will notice the authentic cadence (perfect cadence
Ravel, Boléro
Le boléro (the Bolero) by Maurice Ravel (1875 - 1937) uses the 3/4 time signature:

In this musical sample in C major, you will notice the use of triplets.
Chopin, Nocturne opus 15 n°1
Frédéric Chopin's Nocturne opus 15 n°1 in F Major uses the 3/4 time signature:

(Royalty free musical sample performed by pianist Samson François in 1964, Creative Commons Zero 1.0 license, source)
You will notice the use of eighth note triplets (left piano hand), sixteenth note triplets (measures 9, 10), as well as an anacrusis.
Chopin, Nocturne opus 15 n°3
Frédéric Chopin's Nocturne opus 15 n°3 in G minor uses the 3/4 time signature:

(Royalty free sample performed by pianist Samson François in 1964, Creative Commons Zero 1.0 license, source)
You will notice the use of an anacrusis.