Repetitive Concatenation

All,

I am getting ready to create a spreadsheet to list vendor's names and emails along with other data. I would like to include at the bottom of the email addresses a quick copy and paste distribution list. I have achieved this in the past by using a similar formula:

=CONCATENATE(B3,"; ",B4,"; ",B5)

As you can see it will become very time consuming and not very easy to add names if it gets much longer then 10 names. I know there has to be a way to simplify this process. I have attached an example spreadsheet for your reference. Any and all help is greatly appreciated!