The String trio, through its very nature, is a strikingly different listening experience to its counterpart, the String Quartet. The Quartet brings a certain level of familiarity to the listener as we are more used to hearing 4 part harmony, think of choir and the SATB voicing that is most commonly used in that medium. So it is not unexpected that Beethoven’s approach to the String trio was not unlike his contemporaries, frequently making use of double-stopping across all three instruments to expand the texture that is heard, So when Beethoven approached the Trio it may have almost been in preparation for his yet to come exploration into the quartet. There is certainly a level of development that is noticeable across all three string trios and by the time he wrote the third String Trio - op. 9, any semblance of influence begins to fade and we begin to hear what, in retrospect, are references of things to come.