I'm gonna use this to discuss some of the more difficult songs. If anyone's having a hard time with a particular song, comment and I'll try to edit the post with more information on that song.
First though, some information on score and difficulty
1) Blitz does not have it's own difficulty system.
The difficulties shown are Rock Band difficulties, not Blitz difficulties. Translating songs from 5 buttons to 2 simplifies a lot of things that were previously really difficult. See the opening guitar section in "My Name is Jonas" by Weezer.
2) Score is a matter of multitasking, not accuracy
Going into Blitz mode is cool, but most of the rankings are set up to value a high multiplier over 100% FCs like every other game in this genre. My strategy is to go from one side of the entire track to the other, getting all of my multipliers up twice. If there's time enough for one more pass to get the multiplier up 3 times, great. If not, it's better than only getting your multipliers up once or not at all, or even losing a multiplier. Also, when in doubt, button mash. It helps to at least hit something on those hard solos
3) Listen to the songs first
Here's a playlist on YouTube of all 25 songs included in the gamehttp://www.youtube.com/playlist?list=PL5EA3EE9EADBBFC9A
4) Play all the songs second
Don't get hung up on one song, and while you're playing experiment with the powerups. If you've got any DLC songs, play some of those as well. You'll get better at the game in general rather than one particular pattern. Also, you'll have plenty of coins for powerups when you come back to replay the ones you don't get 5 stars on right out of the gate.
4) USE THOSE POWERUPS FOR THE LOVE OF GOD
Bandmate is the best for me, since it allows me to get essentially double the points and level a track for free. Hold on to your bandmate until the next checkpoint, then burn it immediately at the busiest track on the board or the track that you've got the super powerup set to. You'll still get the bonus points even if your bandmate is playing. Cult of Personality
Jump around tracks like a madman during the verses. It's super easy with the short break right before the downbeat. Your shoud get each track leveled once from left to right, then turn back around and get everything leveled up again right to left. If you don't miss too many, you should have plenty of time to get that 3rd level before the checkpoint. Use Super Guitar since there's 2 solos in this song and you can easily get 90+% accuracy by rhythmically button mashing. Death On Two Legs
This one was really difficult because of how short it is. It's tempting to use Super Keys because of the max difficuty, but go with Super Guitar. The guitar solo toward the end of the song is much easier than that god-awful pattern at the beginning, and the guitar track has a pretty consistent stream of notes. Bandmate is great for tracks on the opposite end of where you're working on (getting the drum/bass track during the verses), but you can really get away with whatever powerup you feel comfortable with. If I remember right I 5-starred this song with Point Doubler and Blast Notes.I'm Still Standing
Either the Vocal or Keyboard track gets the most work, but the Guitar track is the hardest to level, especially during the chorus, since it's just a couple of sustains. Get the guitar track up as high as you can during the verses, then the vocals/keyboards because they're filled with notes. Use your Bandmate to fill in any track you don't want to or don't have the time to, ideally the drum track so you don't have to be moving from one side of the track to the other.Jessie's Girl
The Guitar track is the most consistent so get your Super there, but be warned the Keyboard track only ever has notes during the chorus in the first half of the song
. Get over there as soon as you see the checkpoint coming, and get that track up 3 points before doing anything else. If you can, drop your Bandmate into the guitar track on your way. Kids in the Street
Bandmate & Super Drums will net you a ton of points at the end of the song. Get your multipliers as high as you can, then deploy Bandmate toward the end of the song. Keep yourself on tracks that will give you Overdrive to keep that Bandmate running as long as possible.A Little Less Sixteen Candles, A Little More "Touch Me"
The Bass and Guitar patterns are easily the most active on this track, but they're also terribly consistent. If you're feeling cocky, you can earn an easy 5 Stars by sticking to one of these tracks with the Jackpot boost. Whichever one you prefer, Guitar or Bass, use that super powerup.Moves Like Jagger
Set your Super to Guitar, it gets the most notes of any track by far. Also be aware that the Keyboard and Bass parts are sparse, with them only really kicking in during the song's chorus. Make sure you get them maxed out before the checkpoint. Bass first, as the keyboard track gets a lot of notes toward the end (the short refrain being whistled at the end of the songThis is still an incomplete list. I am working on obtaining this achievement, and will be writing about songs as I 5-star them.