Written and released by Melanie (B-side US #35/A-side UK #9 1970).
Other hit version (as ‘Look What They Done to My Song Ma’) by The New Seekers (US #14/MOR #4/CAN #3/UK #44 1970).
From the wiki: “‘What Have They Done to My Song Ma’ was written by Melanie (Safka). Released in 1970 as the B-side of her ‘Ruby Tuesday’ promotional single for the album Candles in the Rain, the reached the #9 on the UK Singles charts for three weeks.
“Later in 1970, the New Seekers covered Melanie’s song, retitling it to its first lyric line, ‘Look What They Done to My Song Ma’, and scored their first US hit single.”
The New Seekers, “Look What They Done to My Song Ma” (1970):