For this blog post I want to explain metric modulation. Metric modulation is shifting the beat from one note value to another. So let's say you're playing straight quarter notes and then those quarter notes become quarter note triplets. This will usually end up changing the time signature of the song and giving the song a TOTALLY different feel.
In this one of my youtube videos I am playing the mashup of High King of Heaven and Jesus we Love you by Bethel Worship. Technically what happens in the song is what I would consider a "soft metric modulation". More accurately it's just a meter change. The song is going from 3/4 to 6/8 time and luckily we have the same amount of eighth notes in both time signatures. So it's not as drastic of a change of your typical metric modulation, but hey we're playing in church here! We don't want to throw off the congregation's singing do we?
To metrically modulate in this song all it takes is changing how the groupings of the eighth notes are played. In 3/4 time we have three groups of two eighth notes and in 6/8 we have two groups of three eighth notes. This is the primary difference between these two time signatures. Many get that difference confused. A song in 3/4 has a totally different feel than a song in 6/8.