Music edit in FCP X

That's very easy to do.

Select the long music clip and press CMD+G to create a secondary storyline (this is the same as a new "track").
Then blade the clip (CMD+B) at the first marker point and insert the musical phrase.

The beauty of FCP X is that you can easily fine-tune your insert now because any secondary timeline is also magnetic. You can trim the insert at any side and the surrounding clips will automatically adjust, or you can press T and drag on any of the cuts to slide the edit points. Everything will always remain in tempo.

Best wishes,

Ronny

It worked like a charm, Ronny. It cut like butter. Thanks so much. But, just to be a total pain in your ass, what if I wanted to perform an audio transition or dissolve between the old and inserted section? Would I have to put the tracks (or "storylines") on different levels and overlap them and use the fade handles (see pic)? In the example, I only did it on one end. Can it be done on both?

Thanks,
Phil

I will show you a neat trick.

Select the audio clip that is under the secondary storyline and press "P".
Then hold SHIFT and drag the audio clip upward. It will be added to the secondary storyline.
Now you can put regular dissolves between the audio clips (see screenshots).

NOTE: putting dissolves between audio clips is something we got used to in FCP7. And if you are doing all the audio yourself it's a good and fast method. But if your audio needs to be sent to an external audio studio for mixing they will absolutely hate you for having added cross dissolves between audio clips. A professional audio mixer prefers to see superimposed audio lanes with fade handles that he can tweak individually, just like in FCP X.

Best wishes,

Ronny

Thanks again, Ronny.