Just wanted to give an update, as I'm the OP. We played a gig Saturday night...corporate holiday party. (It was a 70's party...they wanted mostly 70's music (with some other stuff thrown in) with 70's outfits. The people were all dressed in 70's outfits.)
I had all the tempos in the Tempo app, on my iPad, and on my iPhone I had the LiveBPM app up. As as as the tempos, I went with the album tempos, where it made sense and where the artists actually play the songs at the album tempo live. (Yay for YouTube.) In a few cases went a few BPMs higher.
Also, before I started using these apps, tempo was an issue for some songs, but certainly not all of them. Many/most of our songs were probably fine beforehand. But some were certainly a problem, which was obvious on the recordings.
The result? First, just starting at the right tempo was, quite obviously, a HUGE improvement. Most of the songs either STAYED at the tempo I started it, or some maybe 1 or 2 BPMS faster. A dramatic improvement.
Listening back, it sounded so much better...Jenny Jenny (867-5309), "Shakey Ground (Delbert McClinton version), September (EWF), "Long Train" (Doobies), "Everyday People" (Sly), "Car Wash", "Good Times" (Chic), "Uptown Funk" (Bruno Mars), and so on. The guitar player was always starting Jenny Jenny too fast; I counted him in; ditto with "Long Train", "Shakey Ground", and so on.
There were maybe two songs where it did go to up to 4 BPMs faster. One of these was "I Want You Back" by the Jackson 5. However, I've seen videos where even the Jackson 5 played it faster than the 98 BPM on the recording. However, quite honestly, I think these sounded better a little faster, and other bands, some of them, pick up the tempo a bit on those.
Some of these, to me, sound the best at the original tempo, especially when the artists play them that way live.
There is one song, I think the band SHOULD play at the same tempo, and even the artist usually plays it at that tempo, from what I've found online, although, I did find one video where he was playing it about at the tempo we got to.
In a nutshell, a HUGE improvement, the gig recording is so much better to listen to, and of one our lead singers was really happy, saying a certain song was no longer rushed. NONE of the songs were runaway fast.
This is all from the first gig we me doing this. Can it still be improved? Absolutely, I'll continue to do this, and point out where it still needs to be fixed.