The music blasts out of the loudspeakers over the practice field behind the Napa Valley Marriott. Rap, some hip-hop, a bit of country and occasionally a classic rock hit.

If it’s the last, you know that’s the head coach’s contribution to the playlist.

“Blue Oyster Cult, Ted Nugent, AC/DC,” said Jack Del Rio, who saw many of the bands at the Day on the Green concerts at the Oakland Coliseum when he was growing up in Hayward. “Journey, Foreigner. When you hear classic rock, that’s coming from me.”

The Raiders’ summer soundtrack is significant in a couple of ways. First, it’s part of the high-energy, upbeat mood around the team.

“We want them to get used to playing with noise and we also want to connect with guys,” Del Rio said. “It keeps the mood light and fresh.”

That’s a big emphasis with the Raiders this training camp. Del Rio is working — on virtually every level — at changing attitudes, energy levels and mind-sets.

“Everything we’re doing is with an eye on creating and sustaining a high-performance environment,” he said.

To that end, he also has hired a high-performance coach — Scott Peltin of the firm Tignum — to work with coaches and players on positive energy and mind-set.

“He came in and talked to us about ways to communicate with each other in a positive way,” Del Rio. “How you eat, sleep. Everything that has to do with performance.”

Del Rio uses phrases like “being mindful” and “bringing positive energy.” He’s not exactly new-agey but he is employing whatever tactics are available to get his team moving in the right direction. The Raiders have been mired in negativity for too long.

“I’m definitely making a concentrated effort to turn the page on all that and look to the future,” said Del Rio, who went as far as asking the alumni who visited camp not to discuss past failures. “This is one of the many ways that we’re going to invest in ourselves, in creating the best environment possible for players and staff.”

Del Rio has collected ideas and strategies for years. From his playing days, his days as the head coach in Jacksonville, his time as Denver’s defensive coordinator.

“I definitely am far more prepared now,” he said. “You’re able to spend some time and think through how you’d do it if you got another opportunity. And apply some of those lessons.”

So you’ll see a little Denny Green, some Jimmy Johnson, a dash of Pete Carroll (who plays music at his practices). Some Bum Phillips, who taught Del Rio that players respond better if they feel like their coaches truly care about them.

And some John Wooden, a legend Del Rio admires. In Jacksonville, Del Rio had Wooden’s Pyramid of Success on the locker room wall and he might introduce it to the Raiders.

“I believe in building a team that way,” Del Rio said of the pyramid, which has a foundation of strong character traits. “It’s simple. It’s wisdom.”

Del Rio is also pleased with the current $8 million investment to improve the team’s Alameda training facility, something he convinced owner Mark Davis was mandatory.

“We want to create an environment where coaches are excited and players are excited about coming to work every day,” he said.

Del Rio speaks and carries himself with more authority and swagger than any other head coach in the Raiders’ recent history. He seems comfortable in his own skin, comfortable enough for a little sartorial splendor, like the cool white Stetson — complete with black Raiders hatband — he wears to deal with the Napa sun. (Del Rio was the only head coach besides the 49ers’ Mike Nolan to wear that black Reebok suit on the sideline a decade ago).

Of course, Del Rio played at USC and had a long NFL career as a linebacker. His exterior confidence is similar to Jim Harbaugh’s, though he has a much more extensive NFL coaching resume and doesn’t seem to have the manic Harbaugh tendencies. But the swagger is similar.

What’s the other reason a little shot of Aerosmith’s “Dream On” coming over the Napa loudspeakers is relevant?

Because it’s a nod to Del Rio’s roots, planted deep in the East Bay, including at those Bill Graham productions on the same field where his team will play this season. Del Rio also has roots in Napa, where his grandfather had a farm not too far from the Raiders’ training grounds, before the valley’s wine boom. He has had old friends stop by training camp to say hello.

Sometimes, Del Rio finds himself overwhelmed at his new position, coaching his childhood team, wearing the colors he loves, surrounded by the familiar.

“Yes, I get sentimental at times,” he said, “because it’s so cool to be home.”