Listen to Probably Not The Most Expensive Thing In This World online. Probably Not The Most Expensive Thing In This World is an Instrumental language song and is sung by Andrew Smith. Probably Not The Most Expensive Thing In This World, from the album It's probably the old the fashioned window they have been using, was released in the year 2021. The duration of the song is 8:32. Download Instrumental songs online from JioSaavn.