i just found a little excerpt of the mac playing "albatross" at the 1969 pop & blues festival in essen, germany:
http://www1.wdr.de/fernsehen/rockpal...tival-100.html
there's 3 vids on this page - click the one in the middle and go to 6:09 . . . and 'ere they are in all their albatross glory!
enjoy
martin