<xsl:variable name="maxVar" select="max(music_set/owned_albums/CD/metacritics)"/>

                    <xsl:element name="Najwyżej_oceniany_album">
                        <xsl:for-each select="music_set/owned_albums/CD">
                                <xsl:choose>
                                    <xsl:when test="metacritics = $maxVar">
                                        <xsl:value-of select="title"/>
                                    </xsl:when>
                                </xsl:choose>
                        </xsl:for-each>
                    </xsl:element>