Trout Mask Replica, by Captain Beefheart (Don Van Vliet) and His Magic Band, is their third release on as many labels.  This album being released on Frank Zappa's Straight Label  STS 1053, is more in keeping with the rather bizarre experimental style on this double album.
With song such as Hair Pie: Bake 1, Pachuco Cadaver, Neon Meate Dream Of A Octafish & Old Fart At Play, this is anything but mainstream, especially in 1969.  On first listen it would seem that the band is just playing randomly and ranting with no planning, but after a few (perhaps quite a few) listens, a musical image emerges and the listener "gets it".  The band actually practised the songs for months, long hours each day to finally be able to play the songs perfectly.  This influential album is highly acclaimed and is listed at #58 on the Rolling Stone's list of top 500 albums of all time. One song would not give you any kind of understanding of this album so following in order are: China Pig,  Well,  Sugar 'n Spikes  &  Hobo Chang Ba.

This music is not for everyone I realise, but...worth a listen.