You have to wonder where they would take the show, especially after the actors all graduated from the fictional William McKinley High School after its fourth season, but Fox was able to continue telling the Glee story when they re-located to New York from the original Ohio setting.
After the real-life death of actor Cory Monteith, the show producers announced that Glee Season 6 will be their final season. With that said, the Season 6 premiere kicked off earlier this year (January 9th, 2015) with a two-hour episode ("Loser Like Me" and "Homecoming").
As typical with all Glee digital singles, you can purchase the songs the week that the show air.
Episode 1 & 2: "Loser Like Me"/"Homecoming" (Jan 9, 2015)
Episode 3: "Jagged Little Tapestry" (Jan 16, 2015)
Episode 4: "The Hurt Locker, Part One" (Jan 23, 2015)
Overall, I have been pretty happy with the music choices for the final season of Glee so far. I suspect since they know it's the final season, they don't really have to play to what is popular and, I hope, they'll continue to covering the more obscure music.
The other thing that sets Empire apart from Glee is that Empire's music (spearheaded by Timbaland) will have original music for the series (instead of just cover songs).