Questions about Past Perfect tense

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Use of Past Simple vs Past perfect in sentences with since

Ann admitted that she hadn't seen her parents since she left London. Is the above sentence OK or do I have to write Ann admitted that she hadn't seen her parents since she had left London. ...
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Grammar: Had been + vb or has been + vb

Should I use '' I had been listening to this concert since it started snowing, at seven.'' or ''I have been listening to this concert since it started snowing, at seven.'' I never know when to use ...