Help me remember the name of a jazz album which has the

[MISSDem]

artist on the cover with his finger over his lip saying "be quiet".

[MADem]

1. You don't remember the artist? What did he look like? What was he wearing?

If you want to page through this site, you might find it: http://www.pixagogo.com/7180565202

[cleveramerican]

2. John Coltrane " Blue Train"

[Forrest Greene]

3. I Don't Think

...it was "Blue Train." In that photo, Coltrane's index finger is horizontal, curled over his lip, as if he were concentrating, perhaps listening to a playback in the studio; not vertical, as is usually the case in the "Shhh" gesture.

You might be thinking of a fairly widely-circulated photo of Miles Davis, from late in his career. However, I don't think it was ever used as an album cover. Here's a version of it:

http://www.art.com/asp/sp-asp/_/pd--10008877/Miles_Davis.htm