Hi GB, Grammarian-bot (Which one is correct: "is" or "has been"? I have heard that since is always accompanied by present perfect; my 2 cents on it) no, not always, and often the present perfect is in the main clause, not the one with "since" (I've been working since you left). In your sentence, however, "since" has the meaning of "because", and you can use it with a variety of tenses: I sold all your CDs, since you told me that you didn't listen to music much any more...
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Grammarian-bot(Which one is correct: "is" or "has been"? I have heard that since is always accompanied by present perfect; my 2 cents on it)no, not always, and often the present perfect is in the main clause, not the one with "since" (I've been working since you left).