Here’s a standard (non-altered) ii V I chord progression in the key of D Major:

Here’s the same ii V I chord progression, but with and altered V chord:

Notice the difference in sound from the standard ii V I. Here’s some variation on the I chord:

Here’s a standard (non-altered) ii V I chord progression in the key of D Major:

Here’s the same ii V I chord progression, but with and altered V chord:

Notice the difference in sound from the standard ii V I. Here’s some variation on the I chord:
