Erkki Melartin (1875-1937); "Pan" vs. extract from "Symphony #6"

"Pan" is clearly very closely related to the Sixth Symphony... but which came first? Melartin finished the Symphony in 1925 having been working on it for several years. The song is said to date from no later than 1920 ~ at this time Melartin set a number of poems by Finland's then most famous poet Veikko Antero Koskenniemi (1885-1962), "Pan" is from his "Runoja" published in 1906. translate.goog...
However... There is much potential confusion with "Pan" Op.161 Film music for Voice & Orchestra (1929-30) ~ a much more substantial work. Sadly this Finnish/German film project fell through, but Melartin was able to salvage & re-use parts of his only foray into film music, for performances in 1930 (possibly arrangements for voice & piano). It remains unpublished. hjp.mbnet.fi/Me... translation; translate.goog...
Here's the original text of Koskenniemi's "Pan";
Oi öistä kulkijaa korpimaan,
ken metsän synkkiin pimentoihin vaipuu,
oi rinnassansa syttyy villi kaipuu
kuin halu hekkumahan hurjimpaan!
Hän näkee metsän synkät silmät vaan
ja kuinka varjot yössä nousee, haipuu,
ja metsän viidakossa oksat taipuu
ja esiin astuu kätköstänsä Pan.
Hän huulillensa nostaa ruokopillin,
hän soittaa, soittaa laulun hurjan villin,
ja metsä sadoin äänin soi ja soi.
Mut öisen kulkijan on järki poissa,
se harhaa metsän synkän sokkeloissa
ja hurjaa onnenunta unelmoi, unelmoi.
And here's a link to the 6th.Symphony ; • Erkki Melartin; "Eleme...