Hi,
<title>...</Title>
Your source is not well-formed XML.
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3c.org/1999/XSL/Transform";>
The namespace should be "http://www.w3.org/1999/XSL/Transform";
<xsl:value-of select="sum(/musik/track/time)" />
xsl:value-of is not an allowed top-level element. Use
<xsl:template match="/">
<xsl:value-of select="sum(/musik/track/time)" />
</xsl:template>
and reread the XSLT spec.
Cheers,
Jarno - DJ Morgan (www.djmorgan.com): DarkNRG