In this example, I have highlighted Bars 23 and 24 of It's a Long Way To Tipperary. As you can see, if you are playing the tune in C, then these two bars are based on E7th
The effect of this chord is usually to provide an exciting mini-climax to the tune, leading to a rapid intake of breath before you motor into the satisfying final eight bars. Incidentally, in these situations, it often happens that those final eight bars (25 - 32) follow The Sunshine Sequence, so that makes improvising through them quite simple. I have written about The Sunshine Sequence before. CLICK HERE FOR MORE INFORMATION.
I've Never Been to New York (the Jonathan Doyle composition)