A familiar occurence at Premier League football matches when a tremendous goal has been scored is a exuberant celebration by the scorer including huge grins, extravagant gesticulations, running and, occasionally, acrobatics. Contrast this with the bahaviour of Eric Cantana when he scored his best goal for Manchester united: he didn't smile, gesticulate or run; he merely turned around with no expression on his face and walked towards his team's half of the field to prepare for the restart after the goal.
A band, if they perform a song magnificently, should, at its end, merely cease playing and singing, return to a more appropriate position on stage if during the song they had moved elsewhere, check any technical necessities, such as guitar tuning, check the set list, and start the next song. What is not necessary and, indeed, is quite unbecoming, is for band members to utter injectives such as "whoop" or "alright", to indulge in conversation with the audience of a celebratory nature, to exchange smiles with other band members and to partake of any other activity that is congradulatory or is a continuation of any ecstatic feelings they may have encoutered during the performance of the now completed song. They should be Eric Cantona not Ricki Villa.
The resons for my instructions are clear: A true complete, perfect and satisfying performance of a song is achieved only if, at its end, all emotional desires are satiated and, thus, there is not only no need for further exhuberation but, moreover, such exhuberation implies a lack of absolute success.