(Had it been plural the article would have also not been needed on a grammatical basis, although I think it would in that case have been fair to specify "some" or "all").
"Tanzania bans fruit for two years"
"Tanzania bans song for two years"
The first can mean all fruit is banned, because "fruit" is a mass noun and as such does not have a plural form.
The second clearly refers to one song, just like the headline refers to one newspaper.
> "Tanzania bans song for two years"
That's ungrammatical as a sentence but a perfectly good headline.
Had it been "Tanzania bans song and dance for two years," you wouldn't have batted an eye.