Interviews and concert footage chronicle generational differences between Woodstock musicians and attendees at the 1969, 1994 and 1999 festivals.
In a candid column for the, the Ulster centre said the Brexit deadlock was a "threat" to the Good Friday peace deal.
"Being a proud Ulsterman and playing for Ireland should not be complicated in the 21St Century ," he added.
Cave also expressed dismay at the "very sad state of affairs" at Stormont.'Consumed my thoughts'
"After Everything we've been through in Northern Ireland , can you imagine The Most successful Ireland captain ever - Rory Best - having to drive through a hard border to play at the Aviva Stadium ?" the 31 year old said.
"How is this good for My Generation ?"Cave questioned whether Rory Best would have to "drive through a hard border" to captain Ireland in Dublin
The UK's withdrawal from the EU had "consumed my thoughts of late", he said, and it "deeply concerns My Generation as peace is all we have ever known".'Modern Ireland '
"The political Landscape . . is a very sad state of affairs," he added.Cave said the global perception of The Republic of Ireland had "radically altered"
He said problems with issues such as healthcare and homelessness had been "ignored" since the collapse of the Northern Ireland Assembly in January 2017.
"For over two years our elected officials have steadfastly refused to govern," said Cave .
That meant that societal issues such as same-sex marriage and abortion had not been addressed in Northern Ireland , he added.
Recent constitutional referendums in The Republic of Ireland have and.
"What is so depressing is that during this very same period of time the global perception of Ireland, has been radically altered following the [same-sex marriage and abortion] referendums," said Cave .
"Gone are so many old perceptions and in their stead appears Dublin, this modern, multi-cultural Society . "