In the first `Music::Refresh` call the lastLength and totalLength are
not initialized. The `lastLength` value is read first from the
musicService. Naturally in the first itereation that is changed and
`UpdateLength()` is called. There the variable `totalLength` is used as
well, but that variable isn't initialed to a sensible value yet. This
leads to sometimes the `Music.h` screen segfaulting (depending on the
random uninitialized data in the `lastLength` variable)
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