The Trio with piano n° 1 in major E flat , opus 1 n° 1, of Ludwig van Beethoven, is a Trio for Piano, Violon and Violoncelle which was composed between 1793 and 1795, published in October 1795 at Artaria in Vienna and dedicated with the n° 2 and n° 3 to prince Karl von Lichnowsky, one of the first patrons of the type-setter with Vienna and former student of Wolfgang Amadeus Mozart.

The first work published by Beethoven (three years after its arrival in Vienna), the Trio n° 1 was already impresses, like his/her two brothers of the opus 1, the mark of their author, with the introduction of a Scherzo between the Adagio and the Finale instead of the already obsolete Minuet. This structure, in four movements, dissociates that of its famous predecessors in this musical form who are Joseph Haydn and Mozart whose trios comprise only three movements. The trio for keyboard, indeed, is regarded as a sonata in trio which comprises three movements commonly: sharp-slow-sharp. There exists a fourth sharp movement which is the minuet, seldom used and that Beethoven will reintroduce and replace by the scherzo. Another characteristic is the length of the partition: four movements an equal length (1100 measurements each one).

The opus 1 was played in particular in front of Haydn which made a mitigated praise of it.

It comprises four movements and its execution lasts approximately 30 minutes:

1. Allegro (major E flat)
2. Adagio cantabile (major A flat)
3. Scherzo. Allegro assai - Trio (minor C)
4. Final. Presto (major E flat)