That is a bit of an overstatement, but essentially true.

Songbird was once an open source audio player for the Linux platform. It was announced on here on their blog that it is discontinuing support.  The announcement does mention that they will still maintain a small Linux build but it will not be tested.

Extract:

After careful consideration, we’ve come to the painful conclusion that we should discontinue support for the Linux version of Songbird. Some of you may wonder how a company with deep roots in Open Source could drop Linux and we want you to know it isn’t without heartache.? We have a small engineering team here at Songbird, and, more than ever, must stay very focused on a narrow set of priorities. Trying to deliver a raft of new features around all media types, and across a growing list of devices, we had to make some tough choices.

My feeling is that Songbird will be developed primarily for the Windows platform.  Thankfully they are still remaining open source (for the time being at least).   I don’t think this is going to send shock waves across the Linux family, mainly because so many other Media players exist.