First recorded by Duane Dee (C&W #44 1968).
Also recorded by Jerry Lee Lewis (1969).
Other hit versions by Linda Martell (C&W #33 1970), Freddy Fender (US #1/C&W #1 1975).
From the wiki: “‘Before the Next Teardrop Falls’ was written in the late 1960s by Vivian Keith and Ben Peters, and had been recorded more than two dozen times – achieving modest success in versions by various performers (the original version by Duane Dee reached #44 on the Billboard country chart in early 1968; Linda Martell sent her version to #33 in early 1970) before becoming a chart-topping hit for Freddy Fender.