1. Terms Used
2. Tempo (bpm) Calculations
3. Delay (ms) Calculations
4. Rhyme Chart

• Tempo - Speed of music; measured in "bpm"
• bpm - Beats per minute; usually 4 beats to a "bar"
• Length - Length of music segment; measured in "bars"
• Time - Duration of music segment

The relationship between Tempo, Time and Length is quite simple. Basically, Length = Tempo x Time. The difficulty arises because of the different units of mesurement used.
- Tempo is in beats per minute (bpm).
- Length is in bars (not beats).
- Time is in seconds (not minutes).
As such, the easiest way to resolve the problem is to introduce a constant of 240 (ie 60 seconds per minute x 4 beats per bar). This normalises the equation as follows:-

For LENGTH in Bars,

For TEMPO in bpm,

For TIME in seconds,

Time is a critical factor when composing music for commercial use. As such, I have provided a table below which gives Tempo settings for 20, 30 and 40 seconds. For example, to achieve 18 seconds in 9 bars requires a tempo of 120bpm.

bpm	Bars
Seconds	4	5	6	7	8	9	10	11	12	13	14
16	60.0	75.0	90.0	105.0	120.0	135.0	150.0	165.0	180.0	195.0	210.0
17	56.5	70.6	84.7	98.8	112.9	127.1	141.2	155.3	169.4	183.5	197.6
18	53.3	66.7	80.0	93.3	106.7	120.0	133.3	146.7	160.0	173.3	186.7
19	50.5	63.2	75.8	88.4	101.1	113.7	126.3	138.9	151.6	164.2	176.8
20	48.0	60.0	72.0	84.0	96.0	108.0	120.0	132.0	144.0	156.0	168.0
Seconds	9	10	11	12	13	14	15	16	17	18	19
26	83.1	92.3	101.5	110.8	120.0	129.2	138.5	147.7	156.9	166.2	175.4
27	80.0	88.9	97.8	106.7	115.6	124.4	133.3	142.2	151.1	160.0	168.9
28	77.1	85.7	94.3	102.9	111.4	120.0	128.6	137.1	145.7	154.3	162.9
29	74.5	82.8	91.0	99.3	107.6	115.9	124.1	132.4	140.7	149.0	157.2
30	72.0	80.0	88.0	96.0	104.0	112.0	120.0	128.0	136.0	144.0	152.0
Seconds	14	15	16	17	18	19	20	21	22	23	24
36	93.3	100.0	106.7	113.3	120.0	126.7	133.3	140.0	146.7	153.3	160.0
37	90.8	97.3	103.8	110.3	116.8	123.2	129.7	136.2	142.7	149.2	155.7
38	88.4	94.7	101.1	107.4	113.7	120.0	126.3	132.6	138.9	145.3	151.6
39	86.2	92.3	98.5	104.6	110.8	116.9	123.1	129.2	135.4	141.5	147.7
40	84.0	90.0	96.0	102.0	108.0	114.0	120.0	126.0	132.0	138.0	144.0

The same equation (as above) can be used to calculate delay times. However, digital delay times are quoted in milliseconds so the equation has to be altered a bit.
For TIME in milliseconds,

The table below lists the various delay times in milliseconds for 16ths of a bar and 12ths of a bar.

Time (ms)	Sixteenths of a Bar									Twelfths of a Bar
bpm	1	2	3	4	5	6	7	8		1	2	4	5
60	250	500	750	1000	1250	1500	1750	2000		333	667	1333	1667
65	231	462	692	923	1154	1385	1615	1846		308	615	1231	1538
70	214	429	643	857	1071	1286	1500	1714		286	571	1143	1429
75	200	400	600	800	1000	1200	1400	1600		267	533	1067	1333
80	188	375	563	750	938	1125	1313	1500		250	500	1000	1250
85	176	353	529	706	882	1059	1235	1412		235	471	941	1176
90	167	333	500	667	833	1000	1167	1333		222	444	889	1111
95	158	316	474	632	789	947	1105	1263		211	421	842	1053
100	150	300	450	600	750	900	1050	1200		200	400	800	1000
105	143	286	429	571	714	857	1000	1143		190	381	762	952
110	136	273	409	545	682	818	955	1091		182	364	727	909
115	130	261	391	522	652	783	913	1043		174	348	696	870
bpm	1/16	1/8	3/16	1/4	5/16	3/8	7/16	1/2		1/12	1/6	1/3	5/12
120	125	250	375	500	625	750	875	1000		167	333	667	833
125	120	240	360	480	600	720	840	960		160	320	640	800
130	115	231	346	462	577	692	808	923		154	308	615	769
135	111	222	333	444	556	667	778	889		148	296	593	741
140	107	214	321	429	536	643	750	857		143	286	571	714
145	103	207	310	414	517	621	724	828		138	276	552	690
150	100	200	300	400	500	600	700	800		133	267	533	667
155	97	194	290	387	484	581	677	774		129	258	516	645
160	94	188	281	375	469	563	656	750		125	250	500	625
165	91	182	273	364	455	545	636	727		121	242	485	606
170	88	176	265	353	441	529	618	706		118	235	471	588
175	86	171	257	343	429	514	600	686		114	229	457	571
180	83	167	250	333	417	500	583	667		111	222	444	556

Here's a simple chart to help with rhyming. Basically you take the last syllable of a word and try starting the syllable with each of the letters in the chart.

For example, if you were trying to rhyme with "orange", the last syllable would be "..ange". Going through the chart, you'd come up with "range", "change" and "strange".

	R	L	H	J	N	V	M
B	BR	BL
C	CR	CL	CH	CHR
D	DR
F	FR	FL
G	GR	GL			GN
K	KR	KL			KN	QU
P	PR	PL	PH
S		SL	SH	SHR		SW	SM
SC	SCR						SK
SP	SPR	SPL			SN
ST	STR
T	TR		TH	THR		TW
W	WR		WH
Y	X	Z	A	E	I	O	U