Honestly, it is a testament to just how popular Madonna really was at that time to realize just how many songs from her first two albums still, thirty years later, receive regular airplay on some stations, particularly those of the Adult Hits variety. (The Classic Hits stations are starting to work her into their playlists, from what I can tell.) Even her very first single, "Holiday", which managed a relatively tame peak position of #16, still gets played. All in all, things were going rather well for a young woman who was just Madonna Louise Ciccone a few years earlier.
With all that said, there is one glaring exception to that list of songs still getting played, that being the third single from Like a Virgin. The title track had, of course, gone straight to #1 (for six weeks), and the follow-up, "Material Girl", hit #2. And then, before the next single was released, Madonna's song "Crazy For You", from the Vision Quest soundtrack, had also hit #1 (knocking the ubiquitous (at the time) song "We Are the World" out of the top spot). And then, finally, came "Angel". ("Dress You Up", the fourth single, also still gets airplay, as does the radio-only "Into the Groove".)*
(Like a Virgin spent three weeks at #1 on Billboard's Top 200 Albums chart. Album ℗1984 Sire Records. Photo courtesy Amazon.com.)
"Angel" rocketed onto Billboard's Hot 100 the week ending April 27, 1985 all the way up at #48. Two months later (the week ending June 29), it peaked at #5. Per Billboard.com, it spent 17 weeks on the Hot 100. The 1985 year-end issue shows that "Angel" was #81 for the year,
In more recent years, "Angel" has all bit disappeared from commercial radio. But the real tragedy is that Madonna herself appears to be neglecting it. She only performed it during one tour, the Like a Virgin tour in 1985. All of Madonna's greatest hits compilations have omitted the track for some reason, a move that, with regard to the latest compilation, Celebration, was referred to as "crazypants".
But regardless of Madonna's feelings about "Angel", it is certainly deserving of more airplay. Any amount of airplay would be an improvement.
* The only other forgotten song of Madonna's from that era was "Gambler", which was supposedly never released in the US for sales or airplay. A second song from the Vision Quest soundtrack, it did sneak onto at least one top 40 station in the US.