4 : ▁On ▁Land ▁is ▁the ▁e ighth ▁solo ▁studio ▁album ▁by ▁British ▁ambient ▁music ian ▁Brian ▁En o . ▁It ▁was ▁the ▁final ▁edition ▁in ▁En o ' s ▁ambient ▁series , ▁which ▁began ▁in ▁ 1 9 7 8 ▁with ▁Music ▁for ▁Air ports . ▁ ▁Over view ▁ ▁On ▁Land ▁is ▁a ▁mixture ▁of ▁synth es izer - based ▁notes , ▁nature / an imal ▁record ings , ▁and ▁a ▁complex ▁array ▁of ▁other ▁sounds , ▁most ▁of ▁which ▁were ▁un used , ▁collected ▁record ings ▁from ▁previous ▁albums ▁and ▁the ▁sessions ▁that ▁created ▁them . ▁As ▁En o ▁explained , ▁"... ▁the ▁making ▁of ▁records ▁such ▁as ▁On ▁Land ▁involved ▁feed ing ▁un he ard ▁t ape ▁into ▁the ▁mix , ▁constant ▁feed ing ▁and ▁rem ix ing , ▁subtract ing ▁and ▁" comp ost ing ". ▁ ▁En o ▁actually ▁found , ▁in ▁the ▁three - year ▁process ▁of ▁making ▁the ▁album , ▁that ▁the ▁synth es izer ▁came ▁to ▁be ▁of ▁" limited ▁useful ness " ▁and ▁that ▁his ▁" inst rument ation ▁shift ed ▁gradually ▁through ▁electro - me chan ical ▁and ▁ac oust ic ▁instruments ▁towards ▁non - inst ru ments ▁like ▁pieces ▁of ▁chain ▁and ▁st icks ▁and ▁stones ▁... ▁I ▁included ▁not ▁only ▁record ings ▁of ▁ro oks , ▁fro gs ▁and ▁insect s , ▁but ▁also ▁the ▁complete ▁body ▁of ▁my ▁own ▁earlier ▁work ". ▁ ▁Despite ▁the ▁music ' s ▁dark ▁lean ings , ▁it ▁is ▁in ▁a ▁sense ▁still ▁highly