Badfinger's "Baby Blue" is suddenly red hot.

The song, which closed the finale of AMC's hit series "Breaking Bad" last night (Sept. 29), has suddenly risen into the top 25 on iTunes' top songs list and is poised for a return to the Billboard charts this week.

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Industry sources suggest the song is set for a nearly 3,000% sales gain in the week ending Sept. 29 and sold nearly 5,000 downloads just last night.. Remarkably, that one-day figure should immediately make the 1972 song earn its largest digital sales week ever. It has never sold more than 1,000 downloads in a single week, according to Nielsen SoundScan.

The tune was originally a top 20 Billboard Hot 100 hit for the rock band, reaching No. 14 on the chart dated April 29, 1972. It was one of six chart hits for the act. The tune was lifted from the British group's album "Straight Up," which was produced by Todd Rundgren and George Harrison. It was released on the Beatles' record label, Apple.

Official sales figures for "Baby Blue" (for the week ending Sept. 29), will be released by SoundScan on Wednesday, Oct. 2. The song could return to the Billboard charts as well, most likely with a placing on the Rock Digital Songs chart.

The song is also reacting strongly with streaming services. According to Spotify, global streams of Badfinger's "Baby Blue" were up 9,000% in the 11 hours after the finale, as compared to the previous 11 hours.