From this nation: Many Senators have proposed changes to minimize the effect of a filibuster. The last significant reform was adopted in 1975 when the Senate voted to change the required number of votes needed to invoke cloture. Prior to this date, two-thirds of the Senate, or sixty-seven votes were needed. Under the 1975 rule, this number was changed to three-fifths, or sixty senators. Some recent proposals include limiting the filibuster to one time per bill, further reducing the number of votes to invoke cloture, and limiting the amount of time for debate once cloture has been invoked.
A vote requires a simple majority (50%+1) to pass. BUT! Before that vote can even be taken, there must be a parliamentary vote, called "cloture", to decide whether or not to even have that vote. And that cloture vote requires 60 votes to pass in the US Senate. So, 60 isn't the minimum to pass a Bill, 60 is the minimum needed to decide whether or not to even have a vote to pass a Bill. Filibustering is a block of the cloture vote, not the floor vote.