Modulation is a temporary key change. What you describe is a chord change - albeit non-diatonic. It's rather like asking what's the modulation from C to Am. It isn't a modulation. And certainly not a key change, although it can sound like either.

However, my 'bible' labels it as extraneous modulation - if the key has actually changed. I was considering what John wrote, where one minor chord went straight to another, as described, as in 'Light my Fire'.

My 'bible' labels it as extraneous modulation - if the key has actually changed. I was considering what John wrote, where one minor chord went straight to another, as described, as in 'Light my Fire'. Which was simply a change from one chord to another, related in a 'parallel' way.

The D♯ is not surprising - being the V of the new key.

Modulation is a temporary key change. What you describe is a chord change - albeit non-diatonic. It's rather like asking what's the modulation from C to Am. It isn't a modulation. And certainly not a key change, although it can sound like either.

Modulation is a temporary key change. What you describe is a chord change - albeit non-diatonic. It's rather like asking what's the modulation from C to Am. It isn't a modulation. And certainly not a key change, although it can sound like either.

However, my 'bible' labels it as extraneous modulation - if the key has actually changed. I was considering what John wrote, where one minor chord went straight to another, as described, as in 'Light my Fire'.